Q329 - Navigation General: Great Lakes and Inland, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. A magnetic compass card is marked in how many degrees?Not learned 2. Apparent wind speed blowing across a MODU under tow can be measured by a(n) __________.Not learned 3. A towboat has the same draft as the barges it is pushing ahead. If the distance from the stern of the towboat to the head of the tow is 800 feet, where is the approximate location of the pivot point of the unit?Not learned 4. What is used to help prevent damage to barges, locks, and landings when you are locking or landing a tow?Not learned 5. At 0000 you fix your position and change course to 090°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?Not learned 6. At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?Not learned 7. At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE?Not learned 8. At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile west of your DR. Which statement is TRUE?Not learned 9. On 27 April 1983, at 1105 DST (ZD +4), what will be the predicted height of tide at Falkner Island, CT?Not learned 10. On 6 June 1983, at 1719 EST (ZD +5), what will be the predicted height of tide at Chester, PA?Not learned 11. What does the abbreviation L.W.R.P. on the navigation maps mean?Not learned 12. According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, where is the center of low pressure located?Not learned 13. According to Buys Ballot's Law, when an observer in the Southern Hemisphere experiences a northwest wind, where is the center of the low pressure located?Not learned 14. How can the accuracy of an azimuth circle be checked?Not learned 15. For an accurate barometer check, you would __________.Not learned 16. In addition to monitoring channel 16, all Corps of Engineer locks may use as working channels __________.Not learned 17. In addition to the National Weather Service, what agency provides plain-language radio weather advisories for the coastal waters of the United States?Not learned 18. When adjusting a magnetic compass for error, which is TRUE concerning the deviation table?Not learned 19. Advection fog is most commonly caused by __________.Not learned 20. You will be advised of any hazardous areas due to the fallout of a nuclear explosive by a message with which code word?Not learned 21. Which agency maintains federal aids to navigation?Not learned 22. Which agency publishes the Light Lists?Not learned 23. What agency of the U.S. Government issues charts of U.S. waters and Coast Pilots?Not learned 24. What agency of the U.S. Government issues charts of U.S. waters and Coast Pilots?Not learned 25. The agonic line on an isomagnetic chart indicates the __________.Not learned 26. Which aid is NOT marked on a chart with a magenta circle?Not learned 27. All aids to navigation listed in the Mississippi River System Light List are shown as miles from a reference point and on the __________.Not learned 28. How are aids to navigation marking the intracoastal waterway (ICW) identified?Not learned 29. Air circulation is caused or affected by __________.Not learned 30. Air masses near the earth's surface __________.Not learned 31. Allied Naval Control of Shipping (NCS) has been established. Which statement is TRUE?Not learned 32. Which is TRUE of an alternating light?Not learned 33. How are altocumulus clouds defined?Not learned 34. You are anchored in the Aleutian Island chain and receive word that a tsunami is expected to strike the islands in six hours. What is the safest action?Not learned 35. What is TRUE concerning an anemometer on a moving vessel?Not learned 36. An aneroid barometer on a boat should always be __________.Not learned 37. An aneroid barometer is an instrument __________.Not learned 38. Aneroid barometers are usually calibrated to indicate atmospheric pressure in which units?Not learned 39. At what angle to the isobars do surface winds blow over the open sea?Not learned 40. Where can the annual change in variation for an area be found?Not learned 41. How is the annual rate of change for magnetic variation shown on a pilot chart?Not learned 42. You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5-mile, 1 mile, and 1.5 miles. Which term is given to these unwanted echoes?Not learned 43. The appearance of nimbostratus clouds in the immediate vicinity of a ship at sea would be accompanied by which of the following conditions?Not learned 44. What should you apply to a fathometer reading to determine the depth of water?Not learned 45. As it approaches, what will a typical warm front bring?Not learned 46. You are approaching Chatham Strait from the south in foggy weather. You have Coronation Island and Hazy Islands on the radar. Suddenly the radar malfunctions. You then resort to using whistle echoes to determine your distance off Coronation Island. Your stopwatch reads 16.3 seconds for the echo to be heard. How far are you off Coronation Island?Not learned 47. You are approaching Gallipolis Lock and Dam. The traffic signal light is flashing red. You should __________.Not learned 48. You are approaching a light fitted with a RACON. How is the light identified on the radar?Not learned 49. You are approaching a light fitted with a RACON. The light may be identified on the radar by __________.Not learned 50. When approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound which signal?Not learned 51. When approaching a lock entrance, the visual signal displayed when a single lock is ready for entrance is a flashing __________.Not learned 52. You are approaching a lock and see a flashing amber light located on the lock wall. Which action should you take?Not learned 53. You are approaching a multiple-span bridge at night. How is the main navigational channel span indicated?Not learned 54. You are approaching an open drawbridge and sound the proper signal. You receive no acknowledgment from the bridge. Which action should you take?Not learned 55. When approaching a preferred-channel buoy, the best channel is NOT indicated by the __________.Not learned 56. You are approaching a sea buoy which emits a racon signal. This signal is most frequently triggered by which type of radar?Not learned 57. You are approaching a swing bridge at night. How do you know that the bridge is open for river traffic?Not learned 58. What is the approximate wave length of an X Band Radar operating on a frequency of approximately 9.5 GHz?Not learned 59. What area of the earth cannot be shown on a standard Mercator chart?Not learned 60. Which is an area of strong westerly winds occurring between 40°S and 60°S latitude?Not learned 61. On an Army Corps of Engineers navigation map, how is each mile A.H.P. on the Lower Mississippi River marked?Not learned 62. You are ascending a river and exchanging navigational information via radiotelephone with a descending vessel. If the descending vessel advises you to "watch for the set" above point X, what would you expect to encounter above point X?Not learned 63. Which are associated with Cumulonimbus clouds?Not learned 64. Atmospheric pressure may be measured with a(n) __________.Not learned 65. Atmospheric pressure at sea level is equal to __________.Not learned 66. When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind, the approach is best made __________.Not learned 67. The average height of the surface of the sea for all stages of the tide over a 19 year period is known by which term?Not learned 68. To avoid error, how should you read the scale of an aneroid barometer?Not learned 69. A backlash below a lock is defined as __________.Not learned 70. Barometers are calibrated at which standard temperature?Not learned 71. What does a barometer measure?Not learned 72. When your barometer reading changes from 30.25 to 30.05 in a 12-hour period it indicates __________.Not learned 73. Barometer readings in weather reports are given in terms of pressure at which reference location?Not learned 74. What is a barometric pressure reading of 29.92 inches of mercury is equivalent to?Not learned 75. The bases of middle clouds are located at altitudes of between __________.Not learned 76. What is the basic principle of the magnetic compass?Not learned 77. The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056° pgc. If the gyro error is 2° E, what bearing would you plot on the chart?Not learned 78. Which is the name given to the belt of light and variable winds between the westerly wind belt and the northeast trade winds?Not learned 79. What benefit is a weather bulletin to a mariner?Not learned 80. Which defines the height of tide?Not learned 81. A bluff bar is a bar __________.Not learned 82. A bold reef is a reef __________.Not learned 83. You are bound for Baltimore via Cape Henry on a 15 knot ship. If the flood at Chesapeake Bay entrance begins at 1800 EST (ZD +5), at what time would you depart from the Chesapeake Bay entrance to have the most favorable current?Not learned 84. Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.Not learned 85. What does a buoy with a composite group-flashing light indicate?Not learned 86. Buoys and day beacons exhibiting a yellow triangle or square painted on them are used __________.Not learned 87. Which buoy will NOT display white retroreflective material?Not learned 88. Which of the buoys listed below could be used to mark an anchorage?Not learned 89. When a buoy marks a channel bifurcation, the preferred channel is NOT indicated by __________.Not learned 90. Buoys which mark dredging areas are painted which color?Not learned 91. How are buoys which mark isolated dangers painted?Not learned 92. Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?Not learned 93. Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?Not learned 94. A buoy marking a wreck will show a(n) __________.Not learned 95. Which buoy may be even numbered?Not learned 96. Which buoy may be odd numbered?Not learned 97. Which buoy may be odd numbered?Not learned 98. Which buoy is NOT numbered?Not learned 99. When a buoy is in position only during a certain period of the year, where may the dates when the buoy is in position be found?Not learned 100. A buoy having red and green horizontal bands would have which light characteristic?Not learned 101. The buoy symbol printed on your chart is leaning to the northeast. What does this indicate?Not learned 102. Which of the buoy symbols shown in illustration D032NG below indicates a safe water mark?Not learned 103. You are in a buoyed channel at night and pass a lighted buoy with an irregular characteristic. Who should you report this to?Not learned 104. A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water is located in which quadrant?Not learned 105. Which cardinal quadrant is represented by the topmark in illustration D024NG below?Not learned 106. What causes deviation in a magnetic compass?Not learned 107. Which causes the Earth's irregular heating?Not learned 108. Which is the cause of tropic tides?Not learned 109. Which causes the wind flow from the horse latitudes to the doldrums to be deflected?Not learned 110. When changing from a compass course to a true course, which should you apply?Not learned 111. The channel under a bridge is marked with lights of the lateral system. The centerline of the channel shall be marked on the bridge in which manner?Not learned 112. You are in a channel inbound from sea. A daymark used to mark a channel junction when the preferred channel is to starboard will have the shape indicated by what letter in illustration D045NG below?Not learned 113. What is a characteristic of cardinal marks?Not learned 114. What is NOT a characteristic of cardinal marks?Not learned 115. Which characteristic and color will a preferred-channel buoy show?Not learned 116. What is characteristic of an isophase light?Not learned 117. Which characteristics will a lighted buoy that is to be left to starboard, when entering a U.S. port from seaward have?Not learned 118. Which of the following is a characteristic of a lighted cardinal mark?Not learned 119. Which would be the characteristic of an occulting light?Not learned 120. What is the characteristic of a quick flashing light?Not learned 121. What characteristics can be used to identify a lighthouse?Not learned 122. Which is a characteristic of the weather preceding an approaching warm front?Not learned 123. You are in charge of a power-driven vessel crossing a river on the Western Rivers. You must keep out of the way of __________.Not learned 124. The chart of a beach area shows a very steep slope to the underwater beach bottom. Which type of breakers can be expected when trying to land a boat on this beach?Not learned 125. On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. Which is TRUE of the red sector?Not learned 126. Charts should be corrected by using information published in which text?Not learned 127. Chart correction information is NOT disseminated through the __________.Not learned 128. A chart has extensive corrections to be made to it. When these are made and the chart is again printed, what term is given to this chart issue?Not learned 129. If a chart indicates the depth of water to be 6 fathoms and your draft is 6.0 feet, what is the depth of the water under your keel? (Assume the actual depth and charted depth to be the same)Not learned 130. Your chart indicates that there is an isolated rock and names the rock using vertical letters. This indicates the __________.Not learned 131. The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply?Not learned 132. How are chart legends which indicate a conspicuous landmark printed?Not learned 133. What do chart legends printed in capital letters indicate about the associated landmark?Not learned 134. Chart legends printed in capital letters show that the associated landmark is __________.Not learned 135. How is a chart with a natural scale of 1:160,000 classified?Not learned 136. A chart position enclosed by a semi-circle is a(n) __________.Not learned 137. A chart position enclosed by a square is a(n) __________.Not learned 138. Which chart has a scale of 1:45,000Not learned 139. A chart with a scale of 1:80,000 would fall into which category?Not learned 140. Charts showing the coast of Mexico are produced by the United States __________.Not learned 141. On charts of U.S. waters, a magenta marking is NOT used for marking a __________.Not learned 142. Which defines the term charted depth?Not learned 143. What are Cirrus clouds primarily composed of?Not learned 144. Civil twilight begins at 1910 zone time on 20 July. Your DR position at that time is LAT 22° 16' N, LONG 150° 06' W. Which statement concerning the planets available for evening sights is TRUE?Not learned 145. Civil twilight occurs at 0558 zone time on 30 December. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the planets available for morning sights is TRUE?Not learned 146. Civil twilight starts at 1812 zone time on 26 August, your DR position at that time is LAT 21°06'S, LONG 14°56'W. Which statement concerning the planets available for evening sights is TRUE?Not learned 147. Which class of tide prevails in the greatest number of important harbors on the Atlantic Coast?Not learned 148. What do clear skies, with the exception of a few cumulus clouds indicate?Not learned 149. On a clear, warm day, you notice the approach of a tall cumulus cloud. The cloud top has hard well-defined edges and rain is falling from the dark lower edge. What should you expect if this cloud passes directly overhead?Not learned 150. The climate of the eastern coast of the Gulf of Mexico __________.Not learned 151. The climate of the northern coast of the Gulf of Mexico is _________.Not learned 152. Clouds are classified according to their __________.Not learned 153. Which cloud commonly produces a halo about the Sun or Moon?Not learned 154. Which clouds are described as high clouds, composed of small white flakes or scaly globular masses, and often banded together to form a "mackerel sky"?Not learned 155. Which cloud is described as a low, dark, sheet-like cloud which is associated with continuous precipitation for many hours?Not learned 156. Which clouds are described as uniform, grayish-white cloud sheets that cover large portions of the sky, and are responsible for a large percentage of the precipitation in the temperate latitudes?Not learned 157. How are clouds formed?Not learned 158. When would cloud formations be minimal?Not learned 159. What is the name of a cloud of marked vertical development (often anvil-shaped) and produces showers?Not learned 160. Clouds with the prefix "nimbo" in their name __________.Not learned 161. A cloud sequence of cirrus, cirrostratus, and altostratus clouds followed by rain usually signifies the approach of which front?Not learned 162. Which clouds is a thin, whitish, high cloud popularly known as "mares' tails"?Not learned 163. Which cloud type is normally associated with thunderstorms?Not learned 164. The Coast Guard broadcasts urgent marine storm warning messages on which of the following frequencies?Not learned 165. The Coast Guard Captain of the Port has excluded all traffic from a section of a port, while a regatta is taking place. Which describes the buoys marking this exclusion area?Not learned 166. Coast Pilots and navigational charts are kept corrected and up-to-date by using the __________.Not learned 167. A coastal chart could have a scale of __________.Not learned 168. When cold air displaces warm air you have a(n) __________.Not learned 169. When a cold air mass and a warm air mass meet, and there is no horizontal motion of either air mass, it is called a(n) __________.Not learned 170. A cold front moving in from the northwest can produce __________.Not learned 171. As a cold front passes how do the pressure and the winds change?Not learned 172. What color lights do lighted information markers display?Not learned 173. What is the color scheme of navigational marks used for informational or regulatory purposes?Not learned 174. What color is a triangular daymark?Not learned 175. What is a common unit of measure for atmospheric pressure?Not learned 176. Which compensates for induced magnetism in the horizontal soft iron of a vessel?Not learned 177. Complete information on weather broadcasts throughout the world is contained in __________.Not learned 178. Which condition(s) is(are) necessary for the formation of dew?Not learned 179. Which condition will occur after a cold front passes?Not learned 180. Which conic projection chart features straight lines which closely approximate a great circle?Not learned 181. Considering the general circulation of the atmosphere, the wind system between latitudes 30° N and 60° N is commonly called the __________.Not learned 182. Which winds are consistent winds and blow from the horse latitudes to the doldrums?Not learned 183. Who should be consulted for changing conditions of controlling depths in major channels?Not learned 184. What does not contribute to the commercial GPS receiver position error?Not learned 185. Which defines the controlling depth of the river?Not learned 186. By convention, what color is the south pole of a magnet painted?Not learned 187. By convention, the Earth's south magnetic pole is which color?Not learned 188. Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets. What causes this distortion?Not learned 189. On the Corps of Engineer's Navigation Maps, the channel is __________.Not learned 190. Which correction(s) must be applied to an aneroid barometer?Not learned 191. The correction(s) which must be applied to an aneroid barometer reading include(s) __________.Not learned 192. If you count 20 seconds between seeing lightning and hearing the thunder, how far is the storm away from you?Not learned 193. In which country would you expect the channels to be marked with the IALA-B Buoyage System?Not learned 194. While on a course of 019°pgc, a light bears 14° on the port bow at a distance of 15.3 miles. What course should you steer to pass 1.5 miles abeam of the light, leaving it to port?Not learned 195. You are on course 027°T and take a relative bearing to a lighthouse of 220°. What is the true bearing to the lighthouse?Not learned 196. You are on course 030°T. The relative bearing of a lighthouse is 45°. What is the true bearing?Not learned 197. You are on course 042°T. To check the course of your vessel you should observe a celestial body on which bearing?Not learned 198. You are on course 209°T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing?Not learned 199. You are on course 090°T when you sight a flashing white light with a characteristic of VQ(9)10s. You immediately change course to 030°T. After one hour, you sight another flashing white light with the characteristic of VQ. You must pass well __________.Not learned 200. You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing?Not learned 201. While on a course of 138°T, a light bears 14° on the starboard bow at a distance of 8.6 miles. What course should you steer to pass 3 miles abeam of the light leaving it to starboard?Not learned 202. You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing?Not learned 203. While on a course of 159°T, a light bears 11° on the starboard bow at a distance of 10.6 miles. What course should you steer to pass 2 miles abeam of the light leaving it to starboard?Not learned 204. You are on course 180°T and take a relative bearing of a lighthouse of 225°. What is the true bearing of the lighthouse?Not learned 205. You are on course 222°T and take a relative bearing of a lighthouse of 025°. What is the true bearing to the lighthouse?Not learned 206. You are on course 238°T. To check the course of your vessel you should observe a celestial body on which bearing?Not learned 207. You are on course 251°pgc and 241° per magnetic compass, when you observe a range in line bearing 192°pgc. The chart indicates that the range is in line on a bearing of 194°T. The variation is 16°E. What is the deviation of the magnetic compass?Not learned 208. You are on course 277°T and take a relative bearing of a lighthouse of 045°. What is the true bearing to the lighthouse?Not learned 209. You are on course 303°T. To check the speed of your vessel you should observe a celestial body on which bearing?Not learned 210. You are on course 344°T and take a relative bearing of a lighthouse of 090°. What is the true bearing to the lighthouse?Not learned 211. You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse?Not learned 212. While on a course of 349°T, a light bears 13° on the starboard bow at a distance of 10.8 miles. What course should you steer to pass 2.5 miles abeam of the light leaving it to starboard?Not learned 213. You are on course 355°T and take a relative bearing of a lighthouse of 275°. What is the true bearing of the lighthouse?Not learned 214. You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?Not learned 215. When crossing a front how do isobars tend to change?Not learned 216. Cumulonimbus clouds are formed by __________.Not learned 217. Cumulonimbus clouds are most likely to accompany a(n) __________.Not learned 218. What do cumulus clouds that have undergone vertical development and have become cumulonimbus in form indicate?Not learned 219. A current moving across a lock entrance toward the river or toward the dam is known by which term?Not learned 220. When does a current perpendicular to a vessel's track have the greatest effect on the vessel's course made good?Not learned 221. If the current and wind are in the same direction, what does the sea surface represent concern the true wind speed?Not learned 222. If the current and wind are in the same direction, the sea surface represents a wind speed __________.Not learned 223. If the current and wind are in opposite directions, what does the sea surface indicate?Not learned 224. If the current and wind are in opposite directions, the sea surface represents __________.Not learned 225. Which is the only cylindrical chart projection widely used for navigation?Not learned 226. The Daily Memorandum contains which information?Not learned 227. The daily recurring pattern of pressure changes most noticeable in low latitudes is the __________.Not learned 228. Where can information about the direction and velocity of rotary tidal currents be found?Not learned 229. The datum from which the predicted heights of tides are reckoned in the tide tables is __________.Not learned 230. The datum from which the predicted heights of tides are reckoned in the tide tables is the same as that used for the charts of the locality. The depression of the datum below mean sea level for Hampton Roads, Virginia is __________.Not learned 231. Which datum is used for soundings on charts of the East Coast of the United States?Not learned 232. During daylight hours black double-cone topmarks are the most important feature of cardinal marks. Which of the four topmarks shown in illustration D030NG below indicates the best navigable water lies to the west of the buoy?Not learned 233. When daylight savings time is kept, the times of tide and current calculations must be adjusted. How can this be accomplished?Not learned 234. A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below?Not learned 235. Which is TRUE of a dead reckoning (DR) plot?Not learned 236. A dead reckoning (DR) plot __________.Not learned 237. When should your dead reckoning position be plotted?Not learned 238. Which describes a deadhead?Not learned 239. A decrease in barometric pressure is associated with all of the following except __________.Not learned 240. Defense plans may cause the operation of electronic aids to navigation to be suspended with __________.Not learned 241. Which defines a light's luminous range?Not learned 242. The range of tide is the __________.Not learned 243. Which defines the term relative humidity?Not learned 244. Which defines a wave's fetch?Not learned 245. What is the definition of height of tide?Not learned 246. The depth of water on a chart is indicated as 23 meters. What does that depth convert to?Not learned 247. The depth of the water is indicated on a chart as 32 meters. What is this equal to?Not learned 248. Descending boats, while awaiting their turn to enter a lock, shall NOT block traffic from the lock. They shall be above the lock by at LEAST __________.Not learned 249. What describes an accurate position that is NOT based on any prior position?Not learned 250. The vertical distance from the tidal datum to the level of the water is the __________.Not learned 251. Which describes a diurnal tide?Not learned 252. What describes a flood current?Not learned 253. Which describes a light having characteristics which include color variations?Not learned 254. Which describes a line of position derived by radar range from an identified point on a coast?Not learned 255. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 256. Which describes the result when you turn on the fast time constant (differentiator) control of a radar?Not learned 257. Which describes the visible range marked on charts for lights?Not learned 258. What does the description "Racon" beside an illustration on a chart mean?Not learned 259. You desire to make good a true course of 129°. The variation is 7°E, magnetic compass deviation is 4°E, and gyrocompass error is 2°W. An easterly wind produces a 4° leeway. What is the course to steer per standard magnetic compass to make the true course good?Not learned 260. You desire to make good a true course of 132°. The variation is 10°W, magnetic compass deviation is 5°E, and gyrocompass error is 5°W. A northeast by east wind produces a 5° leeway. What is the course to steer per standard magnetic compass to make the true course good?Not learned 261. Despite weather predictions for continued good weather, a prudent mariner should be alert for all of the following, EXCEPT a sudden __________.Not learned 262. Determine the time after 0300 CST (ZD +6) when the velocity of the tidal current will be 0.5 knot on 16 April 1983, at Port Arthur Canal Entrance, TX.Not learned 263. You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________.Not learned 264. When determining compass error by an azimuth of Polaris, you enter the Nautical Almanac with the __________.Not learned 265. Which device maintains a continuous graphic record of the heading of the vessel?Not learned 266. The dew point is reached when which condition occurs?Not learned 267. Which is TRUE concerning the dew point temperature?Not learned 268. Which is the difference between the DR position and a fix, both of which have the same time?Not learned 269. The difference between the heights of low and high tide is the __________.Not learned 270. The direction of the southeast trade winds is a result of the __________.Not learned 271. The direction a vessel is pointed at any given time is the __________.Not learned 272. The direction in which a vessel is steered is the course. The path actually followed is the __________.Not learned 273. The direction in which a vessel should be steered between two points is known by which term?Not learned 274. Which is TRUE for the directive force acting on a gyrocompass?Not learned 275. Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, which is TRUE of the current?Not learned 276. Distance along a track line is measured on a Mercator chart by using which method?Not learned 277. What is the distance from the bottom of a wave trough to the top of a wave crest?Not learned 278. The diurnal inequality of the tides is caused by __________.Not learned 279. The diurnal pressure variation is most noticeable in the __________.Not learned 280. The diurnal variation of pressure is most noticeable __________.Not learned 281. The diurnal variation of pressure is not visible in the middle latitudes in winter because __________.Not learned 282. In the doldrums you will NOT have __________.Not learned 283. How are the doldrums characterized?Not learned 284. In the doldrums you can expect __________.Not learned 285. What does a Doppler log in the bottom return mode indicate?Not learned 286. A Doppler log in the volume reverberation mode indicates __________.Not learned 287. When does a Doppler speed log indicate speed over ground?Not learned 288. A Doppler speed log indicates speed over ground __________.Not learned 289. A Doppler speed log indicates speed through the water __________.Not learned 290. You are downbound approaching a lock and see 3 green lights in a vertical line. This indicates __________.Not learned 291. You are downbound on the Ohio River locking through Greenup. The chamber has been emptied and the lower gates are open. You hear one short blast of the whistle from the lock. You should __________.Not learned 292. Your draft is 24 feet. You wish to pass over an obstruction near Lovell Island, MA, on 6 May 1983. The charted depth is 22 feet. Allowing a safety margin of 3.0 feet, what is the earliest time after 0200 DST (ZD +4) that this passage can be made?Not learned 293. A drawbridge may use visual signals to acknowledge a vessel's request to open the draw. Which signal indicates that the draw will NOT be opened immediately?Not learned 294. When drawing a weather map and an isobar crosses a front, the isobar is drawn __________.Not learned 295. The dry bulb temperature is 78°F and the wet bulb temperature is 62°F. What is the relative humidity?Not learned 296. The dry-bulb temperature is 78°F (26°C) and the wet-bulb temperature is 68°F (20°C). What is the relative humidity?Not learned 297. When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?Not learned 298. The dumping of refuse in a lock is permitted __________.Not learned 299. All echo-sounders can measure the __________.Not learned 300. When does the effects of priming of the tides occur?Not learned 301. An electronic depth finder operates on which principle?Not learned 302. You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T at 68 miles from you. What is the course to steer and running time at 13 knots to intercept vessel A?Not learned 303. You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T, 68 miles from you. What is the time to intercept if you make 13 knots?Not learned 304. You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 346°T at 68 miles from you. What is the course to steer at 13 knots to intercept vessel A?Not learned 305. You are enroute to assist vessel A. Vessel A is underway at 5 knots on course 063°T, and bears 136°T at 78 miles from you. What is the course to steer and running time at 13 knots to intercept vessel A?Not learned 306. You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the course to steer at 13 knots to intercept vessel A?Not learned 307. You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the time to intercept if you make 13 knots?Not learned 308. You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 284°T at 43 miles from you. What is the course to steer and running time at 16 knots to intercept vessel A?Not learned 309. You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 284°T, 43 miles from you. What is the time to intercept if you make 16 knots?Not learned 310. You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042° at 105 miles from you. What is the course to steer at 10 knots to intercept vessel A?Not learned 311. You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042°T, 105 miles from you. What is the time to intercept if you make 10 knots?Not learned 312. You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 343°T at 92 miles from you. What is the course to steer at 9 knots to intercept vessel A?Not learned 313. You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133? T, and bears 343? T at 92 miles from you. What is the time to intercept if you make 9 knots?Not learned 314. You are enroute to Jacksonville, FL, from San Juan, P.R. There is a fresh N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter __________.Not learned 315. You are enroute to Sioux City, Iowa on the Missouri River. When would you most likely encounter a frontal thunderstorm?Not learned 316. As you enter a channel from seaward in a U.S. port, which is TRUE of the numbers on the starboard side buoys?Not learned 317. As you enter a U.S. channel from seaward, which is TRUE concerning the numbers on the buoys?Not learned 318. You are entering an African port and see ahead of you a red can-shaped buoy. What action should you take?Not learned 319. When entering a channel from seaward, the numbers on buoys __________.Not learned 320. You are entering an east coast port and see a buoy with a yellow triangle painted on it. What does the symbol indicate?Not learned 321. You will be entering the Mystic River in Connecticut. What is the current at the Highway Bridge at 1900 EST (ZD +5) on 24 January 1983?Not learned 322. You are entering port and have been instructed to anchor, as your berth is not yet available. You are on a SW'ly heading, preparing to drop anchor, when you observe the range lights as shown in illustration D047NG below, on your starboard beam. What action should you take?Not learned 323. In IALA Region B, entering from sea, how would a daymark on the port side of the channel be indicated on a chart?Not learned 324. When entering from seaward, what does a buoy displaying a composite group (2+1) flashing red light indicate?Not learned 325. When entering from seaward, what does a buoy displaying a single-flashing red light indicate?Not learned 326. Between the equator and the 46th parallel of latitude, there are 3099 meridional parts. How many degrees of equatorial longitude does 3099 meridional parts represent?Not learned 327. Which error is NOT included in the term "current" when used in relation to a fix?Not learned 328. At the establishment of Naval Control of Shipping (NCS), ships at sea will __________.Not learned 329. What should you expect when you encounter a tsunami in the open ocean?Not learned 330. You can expect frontal activity when two air masses collide and __________.Not learned 331. What does the expression "the air is saturated" mean?Not learned 332. Your weather chart indicates that you will cross the cold front of a low-pressure system in about 24 hours. Which statement is TRUE?Not learned 333. Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?Not learned 334. Which factor(s) is/are used to develop the charted information of a lighthouse?Not learned 335. What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?Not learned 336. Which feature, when set to zero, might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability?Not learned 337. Which is a feature of a special daymark?Not learned 338. To find the specific phase characteristic of a lighthouse on a sound of the United States you would use which reference?Not learned 339. The first indications a mariner will have of the approach of a warm front will be __________.Not learned 340. A flashing green light displayed at a single lock means that the lock is __________.Not learned 341. A flashing red light displayed at a single lock means that the lock __________.Not learned 342. What does the Flinders bar on a magnetic compass compensate for?Not learned 343. How can you follow the approach of a dangerous cyclonic storm?Not learned 344. Which of the following is the most accurate method of determining gyrocompass error while underway?Not learned 345. Which of the following is associated with consistently high barometric pressure?Not learned 346. Which item is NOT associated with cumulonimbus clouds?Not learned 347. The following boats are approaching a lock. Which has priority for locking?Not learned 348. Which of the following is a boundary between two air masses?Not learned 349. Which of the following causes the development of an occluded front?Not learned 350. Which of the following causes a frontal thunderstorm?Not learned 351. Which of the following describes the difference between true heading and magnetic heading?Not learned 352. Which of the following describes gyrocompass repeaters which reproduce the indications of the master gyrocompass?Not learned 353. Which of the following is NOT a form of precipitation?Not learned 354. All of the following can be found on a Pilot Chart EXCEPT information concerning which item?Not learned 355. Which of the following represents the slope of a warm front?Not learned 356. Which of the following is a standard correction applied to the reading of an aneroid barometer?Not learned 357. Which of the following statements concerning frontal movements is TRUE?Not learned 358. Which of the following statements is FALSE?Not learned 359. Which of the following traits possessed by an articulated light makes it superior to other types of buoys?Not learned 360. The following types of vessels are awaiting lockage on the upper Mississippi. Which type of vessel is normally passed through the lock first?Not learned 361. Which of the following typically happens to the barometric pressure after a cold front passes?Not learned 362. Which of the following is the most useful factor for predicting weather?Not learned 363. The force resulting from the earth's rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called __________.Not learned 364. Which form of cloud, that is often known as "mackerel sky", is generally associated with fair weather?Not learned 365. Which form of navigation may be suspended without notice under defense planning?Not learned 366. What is NOT found in the Mississippi River System Light List?Not learned 367. Of the four light characteristics shown in illustration D019NG below which one does NOT represent a safe water mark of the IALA Buoyage System?Not learned 368. The four standard light colors used for lighted aids to navigation are red, green, white, and __________.Not learned 369. Freezing salt water spray should be anticipated when the air temperature drops below what temperature?Not learned 370. A general chart could have a scale of __________.Not learned 371. General information on enroute weather and climate is found in __________.Not learned 372. General information about the location, characteristics, facilities, and services for U.S. and foreign ports may be obtained from which publication?Not learned 373. Which general weather conditions should you expect to find in a low-pressure system?Not learned 374. Generally speaking, you should expect to find low atmospheric pressure prevailing in the earth's __________.Not learned 375. Generally speaking, in the Northern Hemisphere, when winds are blowing from between SE and SW the barometric reading __________.Not learned 376. You get underway from the shipyard in Chester, PA, at 1515 DST (ZD +4) on 6 August 1983, enroute to sea. You will be turning for eight knots. What current can you expect at Fourteen Foot Bank Light?Not learned 377. On a gnomonic chart, a great circle track between Los Angeles and Brisbane will appear as a __________.Not learned 378. Which government agency publishes the U.S. Coast Pilot?Not learned 379. Most GPS receivers use the Doppler shift of the carrier phase to compute __________.Not learned 380. When is the greatest directive horizontal force exerted on the magnetic compass of a vessel?Not learned 381. A green buoy has a yellow triangle on it. This is a(n) __________.Not learned 382. Red lights may appear on which buoys?Not learned 383. If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?Not learned 384. What is the gyrocompass error resulting from your vessel's movement in OTHER than an east-west direction?Not learned 385. Which handheld instrument is used to measure distances between objects and the ship?Not learned 386. What happens to the barometric pressure after a cold front passes?Not learned 387. A harbor chart could have a scale of __________.Not learned 388. How often is The Local Notice to Mariners updated?Not learned 389. The "head of the bend" is the __________.Not learned 390. You are heading in a northerly direction when you come across an easterly current. Your vessel will respond in which manner?Not learned 391. You are heading out to sea in a buoyed channel and see a quick flashing green light on a buoy ahead of you. In U.S. waters, how should you leave the buoy?Not learned 392. The height of a light is measured from which reference plane?Not learned 393. The height of a wave is the vertical distance from which reference points?Not learned 394. In very high latitudes, the most practical chart projection is the __________.Not learned 395. As a high pressure system approaches, the barometer reading __________.Not learned 396. Which system provides the highest level of commercial navigational accuracy?Not learned 397. You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should take which action?Not learned 398. The horse latitudes are characterized by __________.Not learned 399. The "horse latitudes" are regions of __________.Not learned 400. A HYDROLANT warning would normally be sent for all of the following EXCEPT __________.Not learned 401. A hygrometer is a device used for determining __________.Not learned 402. What does a hygrometer measure?Not learned 403. Under the IALA-A and B Buoyage Systems, what does a buoy with alternating red and white vertical stripes indicate?Not learned 404. Under the IALA-B Buoyage System, which is TRUE of a buoy displaying a red light?Not learned 405. Under the IALA-B Buoyage System, a conical buoy will be __________.Not learned 406. Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be which color?Not learned 407. Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to starboard may display which of the topmarks shown in illustration D046NG below?Not learned 408. The IALA Buoyage Systems do NOT apply to __________.Not learned 409. In the IALA Buoyage System, what do buoys with alternating red and green horizontal bands indicate?Not learned 410. Under the IALA-A Buoyage System, a buoy indicating that the preferred channel is to port when entering from seaward, can have a __________.Not learned 411. Under the IALA-A Buoyage System, a buoy indicating the preferred channel is to port would have __________.Not learned 412. Under the IALA-A Buoyage system, a buoy marking the port hand of the channel when approaching from seaward may NOT have which feature?Not learned 413. Under the IALA-A Buoyage system, a buoy marking the starboard side of the channel when approaching from seaward may have which feature?Not learned 414. Under the IALA - A Buoyage System, a buoy used as a port hand mark would not show which light characteristic?Not learned 415. Under the IALA Buoyage Systems, a cardinal mark may NOT be used to __________.Not learned 416. Under the IALA-A Buoyage System, when entering from seaward, a buoy indicating the preferred channel is to starboard may have which of the following?Not learned 417. Under the IALA-A Buoyage System, a green spar buoy with a triangular topmark would indicate that the buoy __________.Not learned 418. In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, when fitted with lights, will show a __________.Not learned 419. Under the IALA Buoyage Systems, a safe water mark may NOT __________.Not learned 420. Under the IALA Buoyage Systems, safe water marks may show a __________.Not learned 421. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?Not learned 422. Under the IALA Buoyage Systems, which is TRUE of the topmark of a red and white vertically-striped buoy?Not learned 423. Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?Not learned 424. Under the IALA Buoyage Systems, which is TRUE of safe water marks?Not learned 425. Under the IALA Buoyage Systems, a yellow buoy may mark __________.Not learned 426. Under the IALA cardinal system, a mark with quick white light showing 3 flashes every 10 seconds indicates that the safest water in the area is in which location?Not learned 427. Under the IALA cardinal system, what does a mark with a quick white light showing 6 flashes followed by one long flash indicate in relation to the location of the safest water?Not learned 428. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate?Not learned 429. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate?Not learned 430. Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE?Not learned 431. Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE?Not learned 432. Illustration D036NG below represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter D?Not learned 433. Illustration D037NG below represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash?Not learned 434. In illustration D039NG below, which number indicates cirrus clouds?Not learned 435. In illustration D039NG below, what type of cloud is indicated by the number five?Not learned 436. In illustration D039NG below, what type of cloud is indicated by the number four?Not learned 437. In illustration D039NG below, what type of cloud is indicated by the number one?Not learned 438. In illustration D044NG below, a pillar buoy is indicated by which letter?Not learned 439. In illustration D044NG below, what type of buoy is indicated by the letter A?Not learned 440. In illustration D051NG below what is indicated by the position labeled "C"?Not learned 441. In illustration D051NG below, why was the position labeled "C" plotted?Not learned 442. In illustration D051NG below, why was the position labeled "E" plotted?Not learned 443. In illustration D051NG below, why was the position labeled "D" plotted?Not learned 444. Which is the most important information to be obtained from a barometer?Not learned 445. An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle?Not learned 446. What is the most important source of information to be used in correcting charts and keeping them up to date?Not learned 447. You are inbound in a channel marked by a range. The range line is 040°T. You are steering 036°T. The range is in sight as shown in illustration D047NG below, and is closing. Which action should you take?Not learned 448. You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown in illustration D047NG below. The range continues to open. What action should you take?Not learned 449. You are inbound in a channel marked by a range. The range line is 216°T. You are steering 213°T and have the range in sight as shown in illustration D048NG below. Which action should you take?Not learned 450. What indicates a buoy that should be left to port when entering from seaward? (U.S. Aids to Navigation System)Not learned 451. What indicates a dual-purpose buoy?Not learned 452. Which indication on the barometer is most meaningful in forecasting weather?Not learned 453. By what means are indications of the master gyrocompass sent to remote repeaters?Not learned 454. An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?Not learned 455. What will NOT induce errors into a Doppler sonar log?Not learned 456. Where is induced magnetism found?Not learned 457. What information is found in the chart title?Not learned 458. What information is NOT found in the chart title?Not learned 459. Which information is found in the chart title?Not learned 460. Information about major breakdowns, repairs, or other emergency operations with regard to weirs and (or) wicket dams, on the western rivers, may be obtained by consulting the __________.Not learned 461. Which of the sources contains information on Northern Right Whales?Not learned 462. Which information does the outer ring of a compass rose on a nautical chart provide?Not learned 463. Information about the pilotage available at Miami harbor may best be obtained from which publication?Not learned 464. Which information is NOT required to be posted in or near the wheelhouse?Not learned 465. Which text contains information on search and rescue procedures and special, local communications used in Mexican waters?Not learned 466. Which item contains information about temporary, short-term changes affecting the safety of navigation in U.S. waters?Not learned 467. Where can information for updating paper nautical charts primarily be found?Not learned 468. How are you informed of defects or changes in aids to navigation?Not learned 469. You have been informed that dredging operations may be underway in your vicinity. Which buoy indicates the dredging area?Not learned 470. The instrument most commonly used to gather the data for determining the relative humidity is the __________.Not learned 471. An instrument designed to maintain a continuous record of atmospheric pressure is a(n) __________.Not learned 472. An instrument that indicates wind direction is known as a(n) __________.Not learned 473. An instrument that maintains a continuous record of humidity changes is called a __________.Not learned 474. An instrument which maintains a continuous record of temperature changes is called a __________.Not learned 475. Which instrument may a towing vessel, engaged in towing exclusively on the Western Rivers, use in place of a magnetic compass?Not learned 476. What is used to measure wind velocity?Not learned 477. Which instrument is used to measure the relative humidity of the air?Not learned 478. Which instrument is used to predict the approach of a low pressure system?Not learned 479. An instrument useful in predicting fog is the __________.Not learned 480. How is the intensity of a light expressed in the Light Lists?Not learned 481. After inventorying the Naval Control of Shipping publications you find there is no copy of ATP-2, Volume II "Allied Control of Shipping Manual - Bridge Supplement". You should ask for a replacement from the __________.Not learned 482. Isogonic lines are lines on a chart indicating __________.Not learned 483. On an isomagnetic chart, the line of zero variation is the __________.Not learned 484. Which item in illustration D034NG below shows a flashing light?Not learned 485. Which item in illustration D034NG below shows a MorseNot learned 486. Which item in illustration D034NG below shows an occulting light?Not learned 487. After an item of required safety equipment on a towing vessel fails, the owner or Master must consider numerous factors before continuing the voyage. Which factor should NOT be included in his/her decision?Not learned 488. A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol in illustration D015NG below?Not learned 489. The largest waves (heaviest chop) will usually develop where the wind blows __________.Not learned 490. Which is TRUE of a lateral system buoy displaying a quick flashing light?Not learned 491. A latitude line will be obtained by observing a body __________.Not learned 492. What is the length of a nautical mile?Not learned 493. The length of a wave is the length __________.Not learned 494. Which level of accuracy can be obtained utilizing the U.S. Coast Guard's Maritime Differential GPS in an established coverage area?Not learned 495. In which situation is the light characteristic of composite group flashing (2 + 1) used in the Aids to Navigation System on the Western Rivers?Not learned 496. The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers. Which example is required to utilize this characteristic?Not learned 497. The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers for lights on __________.Not learned 498. Which light characteristic may be used on a special mark?Not learned 499. Which light characteristic may be used on a special purpose mark?Not learned 500. Which term describes a light, feathery deposit of ice by sublimation of water vapor directly into the crystalline form on objects whose temperatures are below freezing?Not learned 501. When a light is first seen on the horizon it will disappear again if the height of eye is immediately lowered several feet. When the eye is raised to its former height the light will again be visible. Which term is given to this process?Not learned 502. Which term is given to a light that has a light period shorter than its dark period?Not learned 503. Which is TRUE concerning Light Lists for coastal waters?Not learned 504. The Light List Does NOT contain information on __________.Not learned 505. The Light List indicates that a dayboard is a type TR-SY. Which action should you take?Not learned 506. The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the port side of a vessel under which condition?Not learned 507. What is the light phase characteristic of a lighted isolated-danger mark?Not learned 508. The light rhythm of MorseNot learned 509. Which light signal indicates that you may approach the lock?Not learned 510. Which light signal indicates that you have permission to enter a lock on the Ohio River?Not learned 511. Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?Not learned 512. What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach?Not learned 513. Which would you expect to see on a lighted preferred-channel buoy?Not learned 514. What is a lighted safe water mark fitted with to aid in its identification?Not learned 515. Lighted white and orange buoys must show which color light?Not learned 516. What is most likely to happen when you push a multiple tow into a countercurrent?Not learned 517. What is the name given to lines on a chart which connect points of equal magnetic variation?Not learned 518. A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) __________.Not learned 519. The line connecting the points of the earth's surface where there is no dip is the __________.Not learned 520. A line connecting all possible positions of your vessel at any given time is a __________.Not learned 521. Which line connects the points of zero magnetic dip?Not learned 522. The line which connects the points of zero magnetic dip is __________.Not learned 523. Lines drawn through points on the Earth having the same atmospheric pressure are known by which term?Not learned 524. A line of position is __________.Not learned 525. A line of position from a celestial observation is a segment of which choice?Not learned 526. A line of position formed by sighting two charted objects in line is called a(n) __________.Not learned 527. Lines of position may be __________.Not learned 528. Which term is given to a line on a weather chart connecting places which have the same barometric pressure?Not learned 529. Which list of clouds is in sequence, from highest to lowest in the sky?Not learned 530. A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than which duration?Not learned 531. Little or no change in the barometric reading over a twelve hour period indicates __________.Not learned 532. At which location is the value of sixty nautical miles per degree of geodetic latitude most correct?Not learned 533. The lock chamber is 600 feet X 110 feet. Your towboat is 150 feet X 35 feet. Which of these tows will require a double lockage?Not learned 534. The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with?Not learned 535. A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a __________.Not learned 536. In low latitudes, the high(s) of the diurnal variation of pressure occur(s) at __________.Not learned 537. In low latitudes, the low(s) of the diurnal variation of pressure occur(s) at __________.Not learned 538. In low latitudes the range of the diurnal variation of pressure is up to __________.Not learned 539. Which is a low, uniform layer of cloud resembling fog, but not resting on the ground?Not learned 540. The lunar or tidal day is __________.Not learned 541. Magnets in the binnacles of magnetic compasses are used to reduce which effect?Not learned 542. What do the magnets placed in horizontal trays in the compass binnacle compensate for?Not learned 543. The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. Where is this magnetic force the GREATEST?Not learned 544. What is magnetic dip a measurement of?Not learned 545. At the magnetic equator there is no induced magnetism in the vertical soft iron because __________.Not learned 546. Magnetic information on a chart may be __________.Not learned 547. Which term is given to magnetism which is present only when the material is under the influence of an external field?Not learned 548. If the main channel under a bridge is marked with lights of the lateral system how are the adjacent bridge piers marked?Not learned 549. A major advantage of the NAVTEX system when compared to other systems is that __________.Not learned 550. What is the major limitation in using the Sight Reduction Tables for Air Navigation Volume I (Pub. No. 249) for star sights?Not learned 551. To make sure of getting the full advantage of a favorable current, you should reach an entrance or strait at which time in relation to the predicted time of the favorable current?Not learned 552. When making landfall at night, how can you determine if a light is a major light or an offshore buoy?Not learned 553. When making landfall at night, the light from a powerful lighthouse may sometimes be seen before the lantern breaks the horizon. Which term describes this light?Not learned 554. In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. What causes the development of these clouds?Not learned 555. How many fixed objects are needed to plot a running fix?Not learned 556. How many high waters usually occur each day on the East Coast of the United States?Not learned 557. How many slack tidal currents usually occur each day on the east coast of the United States?Not learned 558. Mariners are FIRST warned of serious defects or important changes to aids to navigation by which means?Not learned 559. Which maritime radio system, consisting of a series of coast stations, transmits coastal warnings?Not learned 560. At the master gyrocompass, the compass card is attached to the __________.Not learned 561. If you are the Master of a towing vessel who’s only working radar no longer functions, what must you do?Not learned 562. Which term is used to express the maximum distance at which a light may be seen under existing visibility conditions?Not learned 563. How may a spherical buoy be identified?Not learned 564. At McAlpine L & D, normal upper pool elevation is 420.0 feet (130.8 meters) MSL, equal to 12.0 feet (3.7 meters) on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet (22.1 meters) above normal pool. What is the clearance if the gage reads 10.6 feet (3.2 meters)?Not learned 565. At McAlpine L & D, normal upper pool elevation is 420.0 feet MSL, equal to 12.0 feet on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet above normal pool. What is the clearance if the gauge reads 27.2 feet?Not learned 566. Mean high water is the average height of __________.Not learned 567. What is the reference datum mean high water used to measure?Not learned 568. Which measurement uses mean high water as the reference plane?Not learned 569. Which is TRUE of mean high water?Not learned 570. Mean low water is the average height of __________.Not learned 571. Mean lower low water is the reference plane used for which measurements?Not learned 572. To measure distance on a Mercator chart between the parallels of LAT 34°30'N and LAT 31°30'N, which 30- mile scale should be used?Not learned 573. Which term is given to the mechanical lifting of air by the upslope slant of the terrain?Not learned 574. On a Mercator chart, 1 nautical mile is equal to __________.Not learned 575. Which type of projection is used to make a Mercator chart?Not learned 576. As a Merchant Marine Officer you are expected to be able to do which of the following?Not learned 577. When a merchant vessel is under the Naval Control of Shipping Organization in wartime, naval authorities may give orders pertaining to __________.Not learned 578. If your mercurial barometer reads 30.50 inches (1033 millibars) and the temperature is 56°F (13°C), what is the correct reading at 55°N, 150°W?Not learned 579. A mercurial barometer at sea is subject to rapid variations in height ("pumping") due to the pitch and roll of the vessel. To avoid this error, measurements of atmospheric pressure at sea are usually measured with a(n) __________.Not learned 580. Which meteorological feature controls the climate of the Gulf of Mexico and the coastal area during late spring and summer?Not learned 581. In a microbarograph, when should the pen be checked and the inkwell filled?Not learned 582. A microbarograph is a precision instrument that provides a __________.Not learned 583. A mid-channel buoy, if lighted, will show a __________.Not learned 584. A mid-channel buoy, may show which light?Not learned 585. In mid-ocean, the characteristics of a wave are determined by three factors. What is NOT one of these factors?Not learned 586. On mid-ocean waters, the height of a wind-generated wave is not affected by the __________.Not learned 587. A millibar is a unit of __________.Not learned 588. On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. What conditions cause this fog?Not learned 589. On the Mississippi River, gage zero is the gage reading measured from the __________.Not learned 590. In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n) __________.Not learned 591. When the Moon's declination is maximum north, which of the following will occur?Not learned 592. When the moon is at first quarter or third quarter phase, what type of tides will occur?Not learned 593. When the moon is new or full, which type of tides occur?Not learned 594. A mooring buoy, if lighted, shows which color light?Not learned 595. What must the owner or Master do if any of the towing vessel's required navigational safety equipment fails during a voyage?Not learned 596. Which name is given to the pressure-sensitive element of an aneroid barometer?Not learned 597. Which name is given to the prevailing winds in the band of latitude from approximately 5°N to 30°N?Not learned 598. What is the name of the region of high pressure extending around the Earth at about 35°N latitude?Not learned 599. In a national emergency, when communicating via the Navy, messages are sent by precedence. A message designated FLASH will be delivered within __________.Not learned 600. In a national emergency, when communicating via the Navy, messages are sent by precedence. A message designated IMMEDIATE will be delivered within __________.Not learned 601. In a national emergency, when communicating via the Navy, messages are sent by precedence. A message designated ROUTINE will be delivered within __________.Not learned 602. The National Geospatial-Intelligence Agency (formerly the National Imagery and Mapping Agency) would produce a chart of the coast of which area?Not learned 603. The National Oceanic and Atmospheric Administration publishes which item?Not learned 604. What natural feature is responsible for the rather even climate found on the Florida peninsula throughout the year?Not learned 605. In the Nautical Almanac provided, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars?Not learned 606. On a nautical chart, what does the inner ring of a compass rose indicate?Not learned 607. Which nautical charts are intended for coastwise navigation outside of outlying reefs and shoals?Not learned 608. A nautical mile is a distance of approximately how much greater than or less than a statute mile?Not learned 609. Which of the Nautical Texts is/are published by the U.S. Coast Guard?Not learned 610. Naval authorities would NOT give orders about which of the following, when the vessel is under control of the Naval Control of Shipping Organization?Not learned 611. Naval Control of Shipping (NCS) publications should be __________.Not learned 612. Which Naval Control of Shipping publication should be aboard your vessel?Not learned 613. Which Naval Control of Shipping publication should be aboard your vessel?Not learned 614. Under Naval Control of Shipping who is responsible for routing and diverting ships and convoys?Not learned 615. A NAVAREA warning carries the following number: 1986/87 (11). Which statement is TRUE?Not learned 616. While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 2 1/2 seconds after the signal was sounded. What is the distance to the shore?Not learned 617. While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's foghorn 4 1/2 seconds after the signal was sounded. What is the distance to the shore?Not learned 618. When navigating in high latitudes and using a chart based on a Lambert conformal projection, which is TRUE?Not learned 619. You are navigating in pilotage waters using running fixes. The maximum time between fixes should be about __________.Not learned 620. When navigating using GPS, what is an indicator of the geometry of the satellites that your receiver is locked onto?Not learned 621. Which is TRUE when navigating a vessel?Not learned 622. Who publishes the navigation charts of the Upper Mississippi River?Not learned 623. How is a navigation light identified on an Army Corps of Engineers navigation map?Not learned 624. The navigation regulations applicable to a U.S. inland waterway can be found in which publication?Not learned 625. On navigational aids, what does the light characteristic "Fl(2+1)" mean?Not learned 626. When the navigational channel passes under a fixed bridge, the edges of the channel are marked on the bridge with what lights?Not learned 627. Which navigational equipment is required to be tested and logged before a towing vessel embarks on a voyage of more than 24 hours?Not learned 628. Which navigational mark may only be lettered?Not learned 629. A navigator fixing a vessel's position by radar __________.Not learned 630. When should a navigator rely on the position of floating aids to navigation?Not learned 631. When do neap tides occur?Not learned 632. Neap tides occur when the __________.Not learned 633. When do neap tides occur?Not learned 634. The needle of an aneroid barometer points to 30.05 on the dial. What does this indicate?Not learned 635. NGA (NIMA) charts are adopting the metric system. In order to change a charted depth in meters to feet you may use the conversion table found __________.Not learned 636. NOAA VHF weather reports are continuously broadcast on VHF channels WX-1, WX-2 and WX-3 on a frequency of __________.Not learned 637. Normal pool elevation is the height in feet of the section of river above a dam. This height is measured from __________.Not learned 638. Above-normal tides near the center of a hurricane may be caused by the __________.Not learned 639. In the North Sea area, you sight a buoy with a quick light showing 3 flashes every 10 seconds. Which topmark in illustration D030NG below would be fitted to this buoy under the IALA Buoyage Systems?Not learned 640. In the North Sea area, you sight a buoy showing a quick white light with 9 flashes every 15 seconds. Which of the four topmarks shown in illustration D030NG below would be fitted to the buoy?Not learned 641. In the North Sea area, you sight a buoy showing a quick white light showing 6 flashes followed by one long flash at 15 second intervals. Which of the four topmarks in illustration D031NG below would be fitted to this buoy?Not learned 642. In the North Sea area, you sight a buoy showing an uninterrupted quick-flashing white light. Which of the four topmarks shown in illustration D031NG below will this buoy be fitted with under the IALA Buoyage system?Not learned 643. A "Norther" in the Gulf of Mexico is __________.Not learned 644. In the Northern Hemisphere, gusty winds shifting clockwise, a rapid drop in temperature, thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies, indicate the passage of a(n) __________.Not learned 645. In the Northern Hemisphere, an observer at point II in illustration D014NG below, should experience a wind shift from what direction?Not learned 646. In the Northern Hemisphere, what do winds veering sharply to the west or northwest with increasing speed indicate?Not learned 647. How can Northern right whales can be identified?Not learned 648. What do the numbers on isobars indicate?Not learned 649. What does the numeral in the center of a wind rose circle on a pilot chart indicate?Not learned 650. A nun buoy will __________.Not learned 651. If you observe a buoy off station which action should you take?Not learned 652. If you observe a rapid fall of barometric pressure, which action should you take?Not learned 653. You have been observing your radar screen and notice that a contact on the screen has remained in the same position, relative to you, for several minutes. Your vessel is making 10 knots through the water. Which statement is TRUE?Not learned 654. When observing a rapid rise in barometric pressure, what may you expect?Not learned 655. How is an occluded front represented on a weather map?Not learned 656. Which is TRUE of an occulting light?Not learned 657. What occurs when rising air cools to the dew point?Not learned 658. Which term defines the ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth?Not learned 659. When one upbound vessel is overtaking another vessel and both are pushing a tow ahead, what reaction may you expect?Not learned 660. When operated over a muddy bottom, a fathometer may indicate which of the following?Not learned 661. On what does the operation of an aneroid barometer depend?Not learned 662. An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?Not learned 663. An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol?Not learned 664. An orange and white buoy marking a danger area will have what symbol on it?Not learned 665. An orange and white buoy with a rectangle on it displays what information?Not learned 666. In order to insure that the racon signal is visible on your 3 cm radar, the __________.Not learned 667. In order to utilize the capacity of a lock to its maximum, pleasure craft are locked through with all of the following EXCEPT which barges?Not learned 668. Which organization operates the Maritime Differential GPS (DGPS)?Not learned 669. You are outbound in a buoyed channel on course 015°T. You sight a white light showing a MorseNot learned 670. You are outbound in a channel marked by a range astern. The range line is 309°T. You are steering 127°T and have the range in sight as shown in illustration D047NG below. What action should you take?Not learned 671. When outbound from a U.S. port, what does a buoy displaying a flashing red light indicate?Not learned 672. At the outbreak of war your ship is caught in an enemy port. Which statement is FALSE?Not learned 673. When the owner or Master inspects his/her towing vessel before embarking on a voyage of more than 24 hours, he/she must check all terminal gear EXCEPT __________.Not learned 674. The owner or Master of a towing vessel must ensure that each person that directs and controls the movement of the vessel knows all of the following EXCEPT _________.Not learned 675. The owner or Master of a towing vessel that is operating within a Vessel Traffic Service (VTS) area must report specific information to the service. Which of the following choices is not required to be reported?Not learned 676. The owner or Master of a towing vessel shall ensure that each person that directs and controls the movement of the vessel can accomplish all of the following EXCEPT _________.Not learned 677. The owner or Master of a towing vessel shall ensure that each person that directs and controls the movement of the vessel can accurately fix the vessel's position using all of the following EXCEPT _________.Not learned 678. The owner or Master of a towing vessel shall ensure that all tests and inspections of gear take place. When are these actions required to be logged?Not learned 679. The owner or Master of a towing vessel shall ensure that all tests and inspections of gear take place and are logged __________.Not learned 680. In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) __________.Not learned 681. The passing of a low pressure system can be determined by periodically checking the __________.Not learned 682. While passing through Memphis, the weather report on the TV news indicates that a cold front is crossing western Kentucky and Tennessee. Tomorrow's weather will be dominated by a high-pressure area. What weather should you expect tomorrow?Not learned 683. Which term defines the paths of intended travel between three or more points?Not learned 684. The path that a vessel is expected to follow, represented on a chart by a line drawn from the point of departure to the point of arrival, is known by which term?Not learned 685. Which refers to the period at high or low tide during which there is no change in the height of the water?Not learned 686. The period of a lighted aid to navigation refers to the __________.Not learned 687. Permanent magnetism is caused by __________.Not learned 688. The permanent magnetism of a vessel may change in polarity due to __________.Not learned 689. The permanent magnetism of a vessel may change in strength due to __________.Not learned 690. The permanent magnetism of a vessel may change in strength due to __________.Not learned 691. Permission to enter the riverward chamber of twin locks is given by the lockmaster and consists of which sound signal?Not learned 692. All persons or vessels within the lock area, including the lock approach channels, come under the authority of which person?Not learned 693. Which piece of navigational safety equipment is NOT required on towing vessels over 12 meters in length, provided that the vessel remains within the navigable waters of the U.S.?Not learned 694. A pilot chart does NOT contain information about which item?Not learned 695. Where is the pivot point of a towboat with a tow ahead?Not learned 696. The place where a channel moves from along one bank of the river over to the other bank of the river is known by which term?Not learned 697. Plain language is usually used on marine weather __________.Not learned 698. You are planning to enter an unfamiliar U.S. port. Which publication provides information about channel depths, dangers, obstructions, anchorages, and marine facilities available in that port?Not learned 699. You are planning a voyage from New York to Norway via the English Channel. Which publication contains information on the dangers to navigation in the English Channel?Not learned 700. You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?Not learned 701. You should plot your dead reckoning position __________.Not learned 702. You should plot a dead reckoning position after every __________.Not learned 703. You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________.Not learned 704. You plot a fix using three lines of position and find they intersect in a triangle. You should plot the position of the vessel __________.Not learned 705. You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position?Not learned 706. You are plotting a running fix. The LOP to be run forward is an arc from a radar range, what technique should be used?Not learned 707. The points on the earth's surface where the magnetic dip is 90° are __________.Not learned 708. Which term is used to define the point where the vertical rise or fall of tide has stopped?Not learned 709. On the pole side of the high-pressure belt in each hemisphere, the pressure diminishes. The winds along these gradients are diverted by the Earth's rotation toward the east. What is the name of these winds?Not learned 710. On the pole side of the trade wind belt, there is an area of high pressure with weak pressure gradients and light, variable winds. This area is called the __________.Not learned 711. The population of northern right whales, an endangered species, numbers approximately __________.Not learned 712. Which position includes the effects of wind and current?Not learned 713. A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________.Not learned 714. Which term is used for a position obtained by applying ONLY your vessel's course and speed to a known position?Not learned 715. Which is the term used for a position obtained by taking lines of position from one object at different times and advancing them to a common time?Not learned 716. A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________.Not learned 717. When possible, a DR plot should always be started from where?Not learned 718. To predict the actual depth of water using the Tide Tables, how does one use the number obtained from the Tide Tables?Not learned 719. The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1300 and turn for 13 knots, at what point will you lose the flood current?Not learned 720. How do preferred channel buoys indicate the preferred channel to transit?Not learned 721. A preferred-channel buoy may be __________.Not learned 722. What does the prefix "nimbo" in a cloud's name mean?Not learned 723. While preparing to enter a Brazilian port, you see ahead a red and green horizontally-striped buoy. The upper band is red. What action should you take?Not learned 724. You are preparing to take a tow from San Diego to Portland, OR. Good seamanship would require that you have on board, available for reference and use, all of the following EXCEPT the __________.Not learned 725. The presence of stratus clouds and a dying wind will usually result in __________.Not learned 726. The pressure gradient between the horse latitudes and doldrums runs __________.Not learned 727. Pressure gradient is a measure of __________.Not learned 728. When do the prevailing westerlies of the Southern Hemisphere blow 17-27 knots?Not learned 729. Where are the prevailing westerlies of the Southern Hemisphere located?Not learned 730. Prevailing winds between 30°N and 60°N latitude are from which direction?Not learned 731. What is the primary source of the earth's weather?Not learned 732. The principal advantage of NAVTEX radio warnings is that __________.Not learned 733. Prior to reading an aneroid barometer, why should you tap the face lightly with your finger?Not learned 734. The probability of a sudden wind may be foretold by __________.Not learned 735. While proceeding along the Mediterranean coast of Spain, you sight the black and yellow buoy shown in illustration D020NG below. Your course is 039°T, and the buoy bears 053°T. What action should you take?Not learned 736. While proceeding along the Norwegian coast on course 039°T, you sight the black-yellow-black banded buoy shown in illustration D021NG below, bearing 053°T. What action should you take?Not learned 737. You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range in line dead ahead. This indicates that you(r) __________.Not learned 738. While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers what does this daymark indicate?Not learned 739. While proceeding downriver, you sight a red triangular-shaped daymark on the left bank. What does this daymark represent under the U.S. Aids to Navigation System on the Western Rivers?Not learned 740. You are proceeding under NCS (Naval Control of Shipping) when it becomes necessary to send a distress message. Which precedence would you assign this message?Not learned 741. You are proceeding under NCS (Naval Control of Shipping) and wish to send a message concerning an initial enemy contact. Which precedence would you assign this message?Not learned 742. You are proceeding under NCS (Naval Control of Shipping) when you wish to send a message concerning your ships diversion. Which precedence would you assign this message?Not learned 743. You are proceeding under NCS (Naval Control of Shipping) and wish to send a message by rapid transmission which does not require a higher precedence. Which precedence would you assign this message?Not learned 744. You are proceeding under NCS (Naval Control of Shipping) and wish to send a message warning of a hurricane. Which precedence would you assign this message?Not learned 745. "Proceeding from seaward" for the purpose of the direction of buoying offshore, lateral system buoys would be proceeding ________.Not learned 746. The proper way to approach a downstream lock where there is an outdraft is to be __________.Not learned 747. A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. What can be determined by comparing these two temperature readings with a set of tables?Not learned 748. Which publication is NOT carried on board U.S. merchant vessels operating under Naval Control of Shipping?Not learned 749. Which publication should you check for complete information on Puget Sound weather conditions?Not learned 750. What publication contains descriptions of the coast line, buoyage systems, weather conditions, port facilities, and navigation instructions for the United States and its possessions?Not learned 751. Which publication contains information on Naval Control of Shipping (NCS) in time of emergency or war?Not learned 752. Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Chesapeake Bay?Not learned 753. What publication contains information about the port facilities in Cadiz, Spain?Not learned 754. In which publication could you find information concerning the minimum lighting required for bridges on U.S. waters?Not learned 755. Which publication indicates the HYDROLANTS or HYDROPACS issued since the previous working day?Not learned 756. What publication has information on the climate, distances, navigation regulations, outstanding landmarks, channels and anchorages of Long Island Sound?Not learned 757. Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?Not learned 758. Which publication(s) must a towing vessel of 12 meters or more in length carry when operating on US waters other than the Western Rivers?Not learned 759. Which publication requires infrequent corrections?Not learned 760. Which publication would describe the explosive anchorages in the ports on the east coast of the United States?Not learned 761. Which publication would NOT be used on a voyage from Houston to New York?Not learned 762. What is published by the U.S. Coast Guard?Not learned 763. What is the purpose of the "reference hand" on an aneroid barometer?Not learned 764. The purpose of the soft iron spheres mounted on arms on the binnacle is to compensate for __________.Not learned 765. When pushing barges ahead close to a steep revetment where there is no current, what is MOST likely to occur?Not learned 766. You are pushing a tow ahead, at high speed, near the right hand bank of a canal. The forces affecting your towboat and tow will tend to __________.Not learned 767. You are pushing a tow ahead and passing close to another towboat which is pushing ahead in the same direction (you are overtaking). After the towheads pass close alongside __________.Not learned 768. When pushing a tow and approaching barges tied off to the shore, you should __________.Not learned 769. Quadrantal error in a gyrocompass has its GREATEST effect on which of the following?Not learned 770. Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1° E. Which true bearing should be plotted on the chart?Not learned 771. Which radar control reduces weak echoes out to a limited distance from the ship?Not learned 772. Which radar control shortens all echoes on the display and reduces clutter caused by rain or snow?Not learned 773. Which radar control is used to reduce sea return at close ranges?Not learned 774. Which term is given to a radar display which is oriented, so that north is always at the top of the screen?Not learned 775. Your radar displays your ship off center. As you proceed on your course, your ship's marker moves on the PPI scope while echoes from land masses remain stationary. What is this display called?Not learned 776. Your radar indicates a target; however, there is no visible object at the point indicated. A large mountain, approximately 50 miles away on the same bearing as the target, is breaking the horizon. You should suspect the radar target is caused by __________.Not learned 777. Radar makes the most accurate determination of the __________.Not learned 778. A radar range to a small, charted object such as a light will provide a line of position in which form?Not learned 779. You are radar scanning for a buoy fitted with a racon. In illustration D017NG below, which radar screen represents the presentation you should expect on the PPI?Not learned 780. Your radar is set on a true motion display. Which of the following will appear to move across the PPI scope?Not learned 781. A rapid rise or fall of the barometer indicates __________.Not learned 782. What is the reaction of a gyrocompass to an applied force known as?Not learned 783. In reading a weather map, what do closely spaced pressure gradient lines indicate?Not learned 784. The recording fathometer produces a graphic record of the __________.Not learned 785. What do red sectors of navigation lights warn mariners of?Not learned 786. Which is the reference datum used in determining the heights of land features on most charts?Not learned 787. The refraction correction table given in the Nautical Almanac is based on a standard or average atmospheric density with a temperature of 50°F (10°C) and which atmospheric pressure?Not learned 788. With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________.Not learned 789. Which is the region containing 3/4 of the mass of the atmosphere and to which are confined such phenomena as clouds, storms, precipitation and changing weather conditions?Not learned 790. In Region A of the IALA Buoyage System, when entering from seaward, the port side of a channel would be marked by which buoy?Not learned 791. IN REGION A of the IALA Buoyage System, when entering from seaward, how would the starboard side of a channel be marked?Not learned 792. In both regions of the IALA buoyage system, which topmark shown in illustration D022NG below is used on a special mark?Not learned 793. In regions near the poles, how are the winds generally described?Not learned 794. A relative bearing is always measured from __________.Not learned 795. What is the relative bearing of an object on the port beam?Not learned 796. What is the relative bearing of an object broad on the port bow?Not learned 797. What is the relative bearing of an object broad on the port quarter?Not learned 798. What is the relative bearing of an object on the starboard beam?Not learned 799. What is the relative bearing of an object broad on the starboard bow?Not learned 800. What is the relative bearing of an object broad on the starboard quarter?Not learned 801. What is the relative bearing of an object dead astern?Not learned 802. What is the relative bearing of an object sighted dead ahead?Not learned 803. Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at __________.Not learned 804. You have replaced the chart paper in the course recorder. What is NOT required to ensure that a correct trace is recorded?Not learned 805. You have replaced the chart paper in the course recorder. Which statement is TRUE?Not learned 806. You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in __________.Not learned 807. With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.Not learned 808. With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.Not learned 809. Restricted areas at locks and dams are indicated by which method?Not learned 810. When is a revised print of a chart made?Not learned 811. The revision date of a chart is printed on which area of the chart?Not learned 812. The rise and fall of the ocean's surface due to a distant storm is known as __________.Not learned 813. In some river mouths and estuaries, the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream. Which term describes this occurrence?Not learned 814. A rock and sand structure extending from the bank of the river toward the channel is known as a __________.Not learned 815. On which route is a towing vessel over 39.4 feet in length NOT required to carry an echo-sounding device?Not learned 816. You are running parallel to the coast and estimate that the current is against you. In plotting a running fix using bearings from the same object on the coast, the greatest safety margin from inshore dangers will result if what speed is used to determine the fix?Not learned 817. You are running parallel to the coast and take a running fix using bearings of the same object. Which is TRUE if you are making less speed than used for the running fix, in relation to the position indicated by the fix?Not learned 818. Safe water buoys may show ONLY which type of light?Not learned 819. A safe water mark may be __________.Not learned 820. How is a safe water mark, that can be passed close aboard on either side, painted and lighted?Not learned 821. A sailing chart could have which scale?Not learned 822. The Sailing Directions contain information on __________.Not learned 823. The Sailing Directions (Enroute) contain which information?Not learned 824. The Sailing Directions (Enroute) contain information on all of the following EXCEPT which topic of information?Not learned 825. The Sailing Directions (Planning Guide) contain information on all of the following EXCEPT which item?Not learned 826. The Sailing Directions are published in the Enroute format and which other format?Not learned 827. If you are sailing from the East Coast of the United States to the Caribbean Sea, which publication would contain information on weather, currents, and storms?Not learned 828. If you were sailing in the North Pacific and were interested in the ice and iceberg limits, where could you find this information?Not learned 829. You are sailing south on the Intracoastal Waterway (ICW) when you sight a green can buoy with a yellow square painted on it. Which of the following is TRUE?Not learned 830. You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which of the following is TRUE?Not learned 831. You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow square painted on it. Which statement is TRUE?Not learned 832. You are sailing south on the Intracoastal Waterway (ICW) when you sight a red nun buoy with a yellow triangle painted on it. Which statement is TRUE?Not learned 833. Scales on aneroid barometers are usually graduated in inches of mercury in the general range of __________.Not learned 834. The scale on a chart is given as 1:5,000,000. What does this ratio indicate?Not learned 835. Which scale is considered a harbor chart?Not learned 836. Which is TRUE of a sea breeze?Not learned 837. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 838. A series of brief showers accompanied by strong, shifting winds may occur along or some distance ahead of a(n) __________.Not learned 839. If several navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List?Not learned 840. In shallow water, waves that are too steep to be stable, causing the crests to move forward faster than the rest of the wave. This occurrence describes which term?Not learned 841. Your ship is in a neutral port when full Naval Control of Shipping is established. You may expect to be boarded and instructed by a(n) __________.Not learned 842. Your ship received a HYDROLANT advising of a special warning to mariners from the Department of State for ships in the Persian Gulf. You are 400 miles south of, and bound for, the Persian Gulf. What action should you take?Not learned 843. Your ship is returning to New Orleans from a foreign voyage and carrying a bulk cargo of anhydrous ammonia. Under what conditions must you must notify the Captain of the Port, New Orleans?Not learned 844. What does the shoreline on charts generally represent?Not learned 845. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.Not learned 846. You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?Not learned 847. You sight a spar buoy with the topmark shown in illustration D027NG below. You must take which of the following actions?Not learned 848. A sign of thunderstorm development is a cumulus cloud __________.Not learned 849. How will the signal from a ramark show on the PPI?Not learned 850. A single barometric pressure reading of 28.60 indicates __________.Not learned 851. A single line of position combined with a dead-reckoning position results in a(n) __________.Not learned 852. A single vertical magnet placed underneath the compass in the binnacle is used to compensate for __________.Not learned 853. When slanted letters are used to spell the name of a charted object you know the __________.Not learned 854. A sling psychrometer is a(n) __________.Not learned 855. What is a sling psychrometer used to measure?Not learned 856. What does a slow, gradual fall of the barometer indicate?Not learned 857. What does a slow rise in the barometric pressure forecast?Not learned 858. When there are small differences between the heights of two successive high tides or two low tides, in a tidal day, the tides are called __________.Not learned 859. Small, visible mound-like protuberances on the bottom of cumulonimbus clouds, that are potential breeding grounds for waterspouts and tornadoes, are called __________.Not learned 860. What do solid green arrows on the main body of a pilot chart indicate?Not learned 861. Sometimes foreign charts are reproduced by NGA. On such a chart a wire dragged (swept) area may be shown in purple or which other color?Not learned 862. If a sound signal is emitted from the oscillator of a fathometer, and two seconds elapse before the returning signal is picked up, what depth of water is indicated?Not learned 863. In which source could you find the number of a chart for a certain geographic area?Not learned 864. In which source could you find the vertical clearance of a bridge on the Ohio River?Not learned 865. The southeast trade winds actually blow in which direction?Not learned 866. A special mark (yellow buoy), if lighted, may exhibit which light rhythm?Not learned 867. A special purpose buoy shall be __________.Not learned 868. What is a "Special Warning"?Not learned 869. Which term is used to describe the speed at which an ocean wave system advances?Not learned 870. The speed of sound through ocean water is nearly always __________.Not learned 871. The speed of sound in water is approximately __________.Not learned 872. A spherical buoy may be __________.Not learned 873. The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?Not learned 874. Spoil grounds, anchorage areas, cable areas, and military exercise areas are all marked by yellow buoys. Which special mark on the buoy will indicate the specific area you are in?Not learned 875. When do Spring tides occur?Not learned 876. Spring tides occur __________.Not learned 877. Which is TRUE concerning the occurrence of Spring tides?Not learned 878. Spring tides are tides that __________.Not learned 879. Squall lines with an almost unbroken line of threatening dark clouds and sharp changes in wind direction, generally precede which front?Not learned 880. "Stand" of the tide is that time when __________.Not learned 881. What is the standard atmospheric pressure as measured in inches of mercury?Not learned 882. What is the standard atmospheric pressure in millibars?Not learned 883. The Star Lists in the Nautical Almanac are based on which of the following magnitudes?Not learned 884. A star is observed at lower transit. The line of position derived from this sight is __________.Not learned 885. Which statement concerning the chartlet in illustration D010NG below is true? (Soundings and heights are in meters)Not learned 886. Which statement concerning the chartlet seen in illustration D010NG below is TRUE? (Soundings and heights are in meters)Not learned 887. Which statement concerning current is TRUE?Not learned 888. Which statement concerning GPS is TRUE?Not learned 889. Which statement describes the prevailing wind direction in mid-winter in the Gulf Coast area?Not learned 890. Which statement about an estimated position is TRUE?Not learned 891. Which statement about the Flinders bar of the magnetic compass is CORRECT?Not learned 892. Which statement about a gnomonic chart is correct?Not learned 893. Which statement about gyrocompass error is TRUE?Not learned 894. Which statement about the gyrocompass is FALSE?Not learned 895. Which statement about Naval Control of Shipping in wartime is TRUE?Not learned 896. Which statement about radio navigational warnings is TRUE?Not learned 897. Which statement is TRUE when comparing cold and warm fronts?Not learned 898. Which statement is TRUE concerning apogean tides?Not learned 899. Which statement is TRUE concerning equatorial tides?Not learned 900. Which statement is TRUE concerning a Mercator projection?Not learned 901. Which statement is TRUE for an unlighted, red and green, horizontally-banded buoy with the topmost band red?Not learned 902. Which is TRUE concerning static crashes on your AM radio?Not learned 903. Steady precipitation is typical of __________.Not learned 904. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 905. You sight an isolated danger buoy with a white flashing light showing a group of two flashes. The buoy indicates you should take which action?Not learned 906. You are steaming on a course of 246°T at 17 knots. At 2107 you observe a lighthouse bearing 207°T. At 2119 the lighthouse bears 179°T. What is your distance off at the second bearing?Not learned 907. While steaming on course 280°T, you sight a buoy showing a very quick flashing (VQ) white light well to port. Maintaining course, you sight another buoy showing a quick flashing (Q) white light. How should you pass?Not learned 908. You are steaming west in the South Atlantic in an extratropical cyclonic storm, and the wind is dead ahead. According to the law of Buys Ballot, where does the center of low pressure lie?Not learned 909. While steaming north of the Irish coast, you sight a buoy which shows the light rhythm shown in illustration D028NG below. How would you pass this buoy?Not learned 910. You are steaming in the open ocean of the North Pacific between the Aleutian Chain and Hawaii. A warning broadcast indicates that an earthquake has occurred in the Aleutians and has generated a tsunami that is predicted to hit Hawaii. What action is necessary for the ship's safety?Not learned 911. You are steaming southward along the west coast of the United States when you encounter a buoy showing a flashing red light. The buoy should be left on __________.Not learned 912. You are steaming southward along the west coast of the United States when you encounter a buoy showing a flashing red light. Which is TRUE concerning the buoy?Not learned 913. You are steaming southward along the west coast of the United States when you sight a buoy showing a flashing green light. How should you pass this buoy?Not learned 914. You are steaming in a westerly direction along the Gulf Coast. You see ahead of you a lighted buoy showing a red isophase light. Which action should you take?Not learned 915. What does a steep barometric gradient indicate?Not learned 916. The steepness of a cold front depends on __________.Not learned 917. You are steering 143°T, and a light is picked up dead ahead at a distance of 18.2 miles at 2006. You change course to pass the light 5.5 miles off abeam to port. If you are making 14.5 knots, what is your ETA at a position 5.5 miles off the light?Not learned 918. You are steering 318°psc. A northeasterly wind causes 3° of leeway. The variation is 14°E and the deviation table is extracted below. What will be the true course made good? DEVIATION TABLE Magnetic Heading Deviation 300° 2°E 315° 0 330° 2°WNot learned 919. While steering a course of 150°T, you wish to observe a body for a latitude check. What would the azimuth have to be?Not learned 920. While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be?Not learned 921. When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should take which action?Not learned 922. You are steering a southerly course, and you note that the chart predicts an easterly current. Without considering wind, how may you allow for the set?Not learned 923. When steering a tow downstream around the shape of a sand bar, and staying on the proper side of the buoys, an operator should be cautious of __________.Not learned 924. All straight lines represent great circle tracks on a chart based on which projection?Not learned 925. Which term is used to describe a structure, usually made of stone, or cement pilings, which extends from the bank at approximately right angles to the current?Not learned 926. "Surface circulation" is another term for __________.Not learned 927. The survey information upon which a chart is based is found at which location?Not learned 928. A survey (special purpose mark) buoy __________.Not learned 929. Swells that have outrun the storm are produced in the __________.Not learned 930. Swell is the rise and fall of the ocean's surface due to __________.Not learned 931. A sylphon cell is a part of which instrument?Not learned 932. The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic describes the light?Not learned 933. The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic does the light possess?Not learned 934. Which symbol represents a 10-fathom curve?Not learned 935. Which symbol represents a 2-fathom curve?Not learned 936. Which of the symbols shown in illustration D018NG below represents an occluded front?Not learned 937. Which of the symbols shown in illustration D018NG below represents a warm front?Not learned 938. What does the symbol shown in illustration D033NG below indicate on a chart?Not learned 939. What is a system of reservoirs and connecting tubes in a gyro compass called?Not learned 940. Which table is NOT found in the U.S. Coast Pilots?Not learned 941. You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix?Not learned 942. You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?Not learned 943. You take a bearing of 086° of a lighthouse. Which bearing of another object would give the best fix?Not learned 944. You take a bearing of 142° and 259° of two objects. Which bearing of a third object will give the best fix?Not learned 945. You take a bearing of 176° of a lighthouse. What bearing of another object would give the best fix?Not learned 946. You take a bearing of 176° of a lighthouse. Which bearing of another object would give the best fix?Not learned 947. You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix?Not learned 948. You take a bearing of 264° of a lighthouse. Which bearing of another object would give the best fix?Not learned 949. You take a bearing of 264° of a lighthouse. What bearing of another object would give the best fix?Not learned 950. You take a bearing of 313° and 076° of two objects. Which bearing of a third object will give the best fix?Not learned 951. You take bearings of 313° T and 076° T on two objects. Which bearing of a third object will give the best fix?Not learned 952. You take a bearing of 356° of a lighthouse. What bearing of another object would give the best fix?Not learned 953. You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix?Not learned 954. You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________.Not learned 955. Which is TRUE as the temperature of an air mass decreases?Not learned 956. Which term describes the temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur?Not learned 957. How does the temperature change with the passage of an occluded front?Not learned 958. Which is TRUE as the temperature for a given mass of air increases?Not learned 959. Which term defines the difference between the heights of low and high tides?Not learned 960. Which term describes a tow that is properly aligned to pass through a narrow opening between two bridge piers or any other critical navigational maneuver?Not learned 961. The term "flood current" refers to that time when the water __________.Not learned 962. Which is the term given to the time required for a lighted aid to complete a full cycle of light changes?Not learned 963. Which term is given to the vertical angle between the horizontal and the magnetic line of force?Not learned 964. What does the term "tide" refer to?Not learned 965. Which term is used to describe a generally circular low-pressure area?Not learned 966. What term is used to describe a river barge designed to carry coal or any similar cargo not requiring weather protection?Not learned 967. What term is used to describe a tank barge constructed with the structural framing inside the cargo tank and the side shell plating containing the cargo?Not learned 968. What term is used to describe a tank barge constructed with the structural framing outside the cargo tank and the cargo tank plating separated from the shell plating?Not learned 969. Which is included in the term "Western Rivers," when it refers to regulations requiring towing vessels to carry navigational-safety equipment, charts or maps, and publications?Not learned 970. The test of a towing vessel's steering gear control system includes each item EXCEPT __________.Not learned 971. Which theoretical minimum number of measurements from satellites does a GPS receiver need in order to provide an exact three-dimensional position?Not learned 972. Three or four feet of the total height of a storm surge in a hurricane can be attributed to __________.Not learned 973. What do the three white lights in a vertical line on a multiple-span bridge indicate?Not learned 974. Which is TRUE of the tides in Boston Harbor?Not learned 975. The time interval between successive wave crests is called the __________.Not learned 976. The time meridian that is used when computing the currents for Pensacola Bay, Florida, is __________.Not learned 977. Which time meridian is used when computing the velocity of the current for Pensacola Bay, Florida?Not learned 978. Which time meridian is used for tide computations in New York Harbor?Not learned 979. The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the __________.Not learned 980. In time of war Naval Control of Shipping Authorities may give orders concerning the __________.Not learned 981. Which topmark shown in illustration D023NG below identifies an isolated danger?Not learned 982. A towboat is pushing barges ahead at a dangerously fast speed when __________.Not learned 983. If a towboat requires a double lockage it shall give which sound signal at a distance of not more than one mile from the lock?Not learned 984. Towing vessels of more than 39.4 feet in length must carry charts or maps __________.Not learned 985. Which towing vessel(s) is/are exempt from carrying radar?Not learned 986. A towing vessel is NOT required to be fitted with radar if it is __________.Not learned 987. A towing vessel is NOT required to be fitted with radar if it is __________.Not learned 988. On a transpacific voyage, you receive a message from your vessel's operators saying that your vessel has been consigned to voluntary Naval Cooperation and Guidance for Shipping (NCAGS). Where can further information be located?Not learned 989. Which is TRUE of an aneroid barometer?Not learned 990. A true bearing of a charted object, when plotted on a chart, will establish a __________.Not learned 991. Which is TRUE concerning the characteristics of a warm air mass?Not learned 992. What is NOT true concerning color sectors of lights?Not learned 993. Which is TRUE concerning the flow of air around an anticyclone in the Southern Hemisphere?Not learned 994. Which is TRUE concerning Hot air?Not learned 995. What is TRUE concerning new editions of Light Lists?Not learned 996. Which is TRUE concerning the speed of sound in water?Not learned 997. The true course from point A to point B is 317°. A SSW wind causes a 4° leeway, variation is 6°W and deviation is 1°E. What is the magnetic compass course to steer to make good the true course?Not learned 998. The true course between two points is 078°. Your gyrocompass has an error of 2°E. You make an allowance of 3° leeway for a north wind. What gyro course should be steered to make the true course good?Not learned 999. The true course between two points is 337°. Your gyrocompass has an error of 3°E and you make an allowance of 5° leeway for a west wind. Which gyro course should be steered to make the true course good?Not learned 1000. Which is TRUE of a downbound power-driven vessel, when meeting an upbound vessel on the Western Rivers?Not learned 1001. Which is TRUE of echo-sounders?Not learned 1002. What is true about a front?Not learned 1003. Which is TRUE when using the radar for navigation?Not learned 1004. Which is TRUE of a vertically-striped buoy?Not learned 1005. Which is TRUE on the Western Rivers when a vessel downbound with a following current is meeting an upbound vessel?Not learned 1006. When trying to sight a lighthouse you notice a glare from a town in the background. How does this affect the range at which the light may be sighted?Not learned 1007. A tsunami is caused by a(n) __________.Not learned 1008. Two navigational hazards are located near to each other, but each is marked by an individual cardinal buoyage system. How are the buoys of one cardinal system identified from the other system?Not learned 1009. Two well-developed high-pressure areas may be separated by which item?Not learned 1010. Two well-developed low pressure areas may be separated by a __________.Not learned 1011. Which type of cloud is among the most dependable for giving an indication of an approaching weather system?Not learned 1012. What type of clouds are associated with a cold front?Not learned 1013. Which type of cloud is the classic "thunderhead"?Not learned 1014. Which type of cloud is composed entirely of ice crystals and is found at very high altitudes?Not learned 1015. Which type of cloud formation should be of immediate concern to small craft operators?Not learned 1016. From which type of cloud can a tornado or waterspout develop?Not learned 1017. The type of current which will have the greatest effect on the course made good for your vessel is __________.Not learned 1018. Which type of daymark is used to mark the starboard side of the channel when entering from sea?Not learned 1019. Which type of front forms when a cold front overtakes and forces a warm front upwards?Not learned 1020. Which type of frontal passage is associated with a relatively narrow band of precipitation?Not learned 1021. Which type of GPS receiver has at least four channels to process information from several satellites simultaneously?Not learned 1022. Which type of precipitation occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level?Not learned 1023. Which type of precipitation is a product of the violent convection in thunderstorms?Not learned 1024. Which type of weather could you expect soon after seeing "hook" or "comma" shaped cirrus clouds?Not learned 1025. What is typical of warm front weather conditions?Not learned 1026. What U.S. agency is responsible for NAVAREA warnings?Not learned 1027. Under the U.S. Aids to Navigation System, which category is a yellow buoy?Not learned 1028. In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?Not learned 1029. In the U.S. Aids to Navigation System, what do red and green horizontally-banded buoys mark?Not learned 1030. Under the U.S. Aids to Navigation System, a special mark possesses which of the following characteristics?Not learned 1031. Under the U.S. Aids to Navigation System used on the Western Rivers, which is TRUE of the aids to navigation lights on the right descending bank?Not learned 1032. Under the U.S. Aids to Navigation System on the Western Rivers, what color are the buoys marking the starboard side of the channel when going upstream?Not learned 1033. Under the U.S. Aids to Navigation System on the Western Rivers, a daymark on the right descending bank will __________.Not learned 1034. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the left descending bank?Not learned 1035. In the U.S. Aids to Navigation System on the Western Rivers, the light characteristic of group flashing (2) is used for which purpose?Not learned 1036. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the right descending bank?Not learned 1037. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy?Not learned 1038. In the U.S. Aids to Navigation System on the Western Rivers, a preferred channel buoy to be left to port while proceeding downstream will __________.Not learned 1039. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a daymark on the right descending bank?Not learned 1040. On U.S. charts, how you can tell if a named feature such as a rock (i.e. Great Eastern Rock in Block Island Sound) is submerged?Not learned 1041. The U.S. Coast Guard publishes __________.Not learned 1042. You are underway in an area where the charted depth is 8 fathoms. You compute the height of tide to be -4.0 feet. The draft of your vessel is 5.0 feet (1.52 meters). You determine the depth of the water beneath your keel to be __________.Not learned 1043. You are underway on course 241°T at a speed of 18.2 knots. You sight a daymark bearing 241°T at a radar range of 3.9 miles at 1006. If you change course at 1009, what is the course to steer to leave the daymark abeam to starboard at 1.0 mile?Not learned 1044. You are underway on course 127°T. You sight a buoy with the topmarks shown in illustration D025NG below, bearing two points on the starboard bow. Which action must be taken?Not learned 1045. You are underway on course 142°T when you sight a buoy bearing 105°T. The buoy's white light has a characteristic of continuous very-quick flashing. What should you do to ensure that your vessel remains in the best navigable water?Not learned 1046. You are underway on course 215°T while turning for an engine speed of 12 knots. The current is 000°T at 2.3 knots. What is the speed being made good?Not learned 1047. You are underway on course 328°T when you sight a buoy broad on your port bow. Which would indicate that you are in the best navigable water?Not learned 1048. You are underway in the North Sea on course 216°T when you sight a buoy bearing 021° relative. Under the IALA Buoyage System, you are in the best navigable water if the buoy has which of the following characteristics?Not learned 1049. You are underway and pass by a lighthouse. Its light, which was white since you first sighted it, changes to red. What does this indicate?Not learned 1050. You are underway in a vessel with a draft of 6.0 feet. You are in an area where the charted depth of the water is 4 fathoms. You would expect the depth of water beneath your keel to be approximately __________.Not learned 1051. You are underway in a vessel with a draft of 7.0 feet (2.1 meters). The charted depth for your position is 9 fathoms. You compute the height of tide to be +3.0 feet (0.9 meters). You determine the depth of the water beneath your keel to be __________.Not learned 1052. Under the Uniform State Waterway Marking System how is a mooring buoy painted?Not learned 1053. In the United States, who broadcasts the short-range radio navigational warnings?Not learned 1054. In United States waters, a buoy having red and white vertical stripes if lighted, it will have which light characteristic?Not learned 1055. It is unlawful to approach within how many yards of a Northern Right Whale?Not learned 1056. You are upbound approaching a lock and dam and see two green lights in a vertical line. What does this indicate?Not learned 1057. While upbound through Memphis, the weather report on the TV news indicates that a cold front will cross western Kentucky and Tennessee the next morning. What weather should accompany this front?Not learned 1058. While upbound through Memphis, the weather report on TV news indicates that a warm front is stationary over Kentucky - Missouri - Tennessee areas. What weather conditions should you expect?Not learned 1059. Which is used to mark the draw span of a floating drawbridge?Not learned 1060. When using a buoy as an aid to navigation which of the following should be considered?Not learned 1061. When using an echo sounder in deep water, it is NOT unusual to encounter which situation?Not learned 1062. When using GPS, how many theoretical position lines are required for a two-dimensional fix?Not learned 1063. When using GPS without Selective Availability, what can you expect your horizontal accuracy to be of the unit?Not learned 1064. When using horizontal sextant angles of three objects to fix your position, an indeterminate position will result in which situation?Not learned 1065. When using a Lambert conformal chart in high latitudes, which reference is used to measure angles such as bearings or courses?Not learned 1066. You are using a radar in which your own ship is shown at the center, and the heading flash always points to 0°. If bearings are measured in relation to the flash, what type of bearings are produced?Not learned 1067. When using a radar in an unstabilized mode, fixes are determined most easily from __________.Not learned 1068. When using a recording depth finder in the open ocean, what phenomena is most likely to produce a continuous trace that may not be from the actual ocean bottom?Not learned 1069. When utilizing a Pacific Coast chart, which is the reference plane of soundings?Not learned 1070. The values of the Greenwich hour angle and declination, tabulated in all almanacs, are for the _________.Not learned 1071. The value of sixty nautical miles per degree of geodetic latitude is most correct at __________.Not learned 1072. How is variation indicated on a small-scale nautical chart?Not learned 1073. The velocity of a rotary tidal current will be decreased when the Moon is at which phase?Not learned 1074. What will be the velocity of the tidal current south of Doubling Point, ME, at 1357 EST (ZD +5) on 3 April 1983?Not learned 1075. The velocity of the wind, its steady direction, and the amount of time it has blown determines what about a wind driven current?Not learned 1076. The vertical component of the Earth's magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation?Not learned 1077. Your vessel has changed course and is heading 285°T, you are on the charted range and it appears as in illustration D048NG below. After several minutes the range appears as in illustration D047NG below and your heading is still 285°T. What does this indicate?Not learned 1078. Your vessel is on a course of 221°T at 15 knots. At 0319 a light bears 198.5°T, and at 0353 the light bears 176°T. At what time and distance off will your vessel be when abeam of the light?Not learned 1079. Your vessel is on a course of 082°T at 19 knots. At 0255 a light bears 059.5°T, and at 0312 the light bears 037°T. At what time and distance off will your vessel be when abeam of the light?Not learned 1080. Your vessel is on a course of 358°T at 19 knots. At 0316 a light bears 024.5°T, and at 0334 the light bears 043°T. At what time and at what distance off will your vessel be when abeam of the light?Not learned 1081. A vessel crossing a river on the Western Rivers, must keep out of the way of which power-driven vessel?Not learned 1082. INLAND ONLY A power-driven vessel crossing on the Western Rivers has the right of way over which vessels?Not learned 1083. Your vessel is located at position I on the weather map in illustration D013NG below. You should experience which weather condition?Not learned 1084. Your 1600 GRT vessel will be entering the navigable waters of the United States. You are required by regulations to take which action?Not learned 1085. Your vessel is entering port when you change course and steady up on a range with the lights in line. After a few minutes you observe the range lights as shown in illustration D047NG below. How should your heading be altered?Not learned 1086. Your vessel is entering port and you have steadied up on a range, dead ahead, in line with your keel. After a few minutes the range, still dead ahead, appears as shown in illustration D047NG below. Which action should you take?Not learned 1087. Your vessel goes aground in soft mud. You would have the best chance of refloating it on the next tide if it grounded at __________.Not learned 1088. As your vessel is heading southward along the east coast of the United States, you encounter a buoy showing a red flashing light. How should you pass this buoy?Not learned 1089. Your vessel is leaving New York harbor in dense fog. As the vessel slowly proceeds toward sea, you sight a green can buoy on the starboard bow. Which action should you take?Not learned 1090. Vessels should maintain a sharp lookout, especially during December through March, when navigating the Northern Right Whale's only known calving grounds. Where are the calving grounds located?Not learned 1091. Your vessel is making way through the water at a speed of 12 knots. Your vessel traveled 30 nautical miles in 2 hours 20 minutes. What current are you experiencing?Not learned 1092. A vessel's position should be plotted using bearings of __________.Not learned 1093. Your vessel is proceeding up a channel, and you see a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 196°T, and the variation is 7°E. If the heading of your vessel at the time of the sighting is 192° per standard magnetic compass, what is the deviation?Not learned 1094. Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 093°T, and the variation is 6°E. If the heading of your vessel at the time of the sighting is 097° per standard magnetic compass, what is the correct deviation?Not learned 1095. Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 283°T, and the variation is 13°E. If the heading of your vessel at the time of the sighting is 278° per standard compass, what is the deviation?Not learned 1096. Your vessel is proceeding up a channel steering on a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 249°T, and the variation is 14°E. If the heading of your vessel at the time of the sighting is 226° per standard magnetic compass, what is the correct deviation?Not learned 1097. INLAND ONLY A power-driven vessel proceeding downstream in a narrow channel on the Western Rivers sights another power-driven vessel moving upstream. Which vessel has the right of way?Not learned 1098. If your vessel were proceeding upriver (ascending), how is the port side of the channel marked according to the U. S. Aids to Navigation System on the Western Rivers?Not learned 1099. If your vessel were proceeding down river (descending), what would a green square marker with a green reflector border on the right bank indicate?Not learned 1100. Vessels regularly navigating Ohio and Mississippi rivers above Cairo, Illinois, and their tributaries, shall at all times have on board a copy of __________.Not learned 1101. A vessel sighting a northern right whale dead ahead should __________.Not learned 1102. Your vessel is underway on a course of 323.5°T at a speed of 16 knots. At 1945 a light bears 350°T. At 2010 the light bears 008.5°T. What will be your distance off when abeam of the light?Not learned 1103. How does visibility change after the passage of a cold front?Not learned 1104. What volume of the Coast Guard Light List is used for the Mississippi River system?Not learned 1105. On a voyage along the coast of France, you sight a buoy with the top marks as shown in illustration D026NG below. How should you steer your vessel?Not learned 1106. When a warm air mass is adjacent to a cold air mass, the separation line between the two is called a(n) __________.Not learned 1107. When a warm air mass overtakes a cold air mass, which term is given to the contact surface?Not learned 1108. As a warm front approaches how does barometric pressure change?Not learned 1109. In waters where the cardinal system is used where would you expect to find danger?Not learned 1110. If your weather bulletin shows the center of a low-pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?Not learned 1111. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 1112. Weather conditions in the middle latitudes generally move in which direction?Not learned 1113. A weather forecast states that the wind will commence veering. In the Northern Hemisphere, what changes will occur?Not learned 1114. When does a weather front exist?Not learned 1115. Weather information is available from __________.Not learned 1116. Weather information provided by the National Weather Service (NWS) advisories should be used along with which other source of information?Not learned 1117. On a weather map, what does a large letter "H" indicate?Not learned 1118. Weather patterns in the Gulf of Mexico area of the United States are _____.Not learned 1119. Which is a weekly publication advising mariners of important matters affecting navigational safety?Not learned 1120. On the Western Rivers, a vessel crossing a river must __________.Not learned 1121. What does a white buoy with a blue band signify?Not learned 1122. What does a white buoy with an open-faced orange diamond on it indicate?Not learned 1123. What does a white buoy with an orange circle marked on it indicate?Not learned 1124. What does a white buoy with an orange cross within a diamond marked on it indicate?Not learned 1125. What does a white buoy with an orange rectangle on it indicate?Not learned 1126. White lights may be found on which buoys?Not learned 1127. What do widely spaced isobars on a weather map indicate?Not learned 1128. Which winds have the greatest effect on the set, drift, and depth of the equatorial currents?Not learned 1129. Which wind pattern has the most influence over the movement of frontal weather systems over the North American continent?Not learned 1130. The winds of the "roaring forties" are strongest near which latitude?Not learned 1131. During the winter months, the southeast trade winds are __________.Not learned 1132. You wish to make good a course of 230°T while turning for an engine speed of 12.5 knots. The set is 180°T, and the drift is 1.7 knots. What course should you steer?Not learned 1133. You wish to measure the distance on a Mercator chart between a point in latitude 42°30'N and a point in latitude 40°30'N. To measure 30 miles at a time where should you set the points of the dividers to obtain the most accuracy?Not learned 1134. You wish to measure the distance on a Mercator chart between a point in latitude 43°30'N and a point in latitude 40°30'N. To measure 30 miles at a time, where should you set the points of the dividers to obtain the most accurate measurement?Not learned 1135. If within 500 yards (460m) of a Northern Right Whale, you are lawfully obligated to take which actions?Not learned 1136. On a working copy of a weather map, a cold front is represented by what color line?Not learned 1137. The world is divided into NAVAREAS for the dissemination of important marine information. Which NAVAREAS include the U.S. coasts?Not learned 1138. Which would you consult for information about the general current circulation in the North Atlantic Ocean?Not learned 1139. Where would you expect to find channels marked with the IALA-A Buoyage System?Not learned 1140. Where would you expect to find climatological and meteorological tables for the Gulf Coast area?Not learned 1141. Where would you find information about the time of high tide at a specific location on a particular day of the year?Not learned 1142. Where would you obtain data on currents for areas of the world not covered by the U.S. National Ocean Service?Not learned 1143. Which would be the subject of a NAVAREA warning?Not learned 1144. Yellow lights may appear on which buoys?Not learned 1145. On 23 March 1983, at Kingston Point, NY, what is the earliest time after 1700 EST (ZD +5) that the predicted tide will be +2.0 feet?Not learned 1146. You desire to make good a true course of 038°. The variation is 5°E, magnetic compass deviation is 4°W, and gyrocompass error is 4°W. A southeasterly wind produces a 4° leeway. What is the course to steer per standard magnetic compass to make the true course good?Not learned 1147. You desire to make good a true course of 236°. The variation is 8°E, magnetic compass deviation is 1°E, and gyrocompass error is 3°W. A south-southeasterly wind produces a 1° leeway. What is the course to steer per standard magnetic compass (psc) to make the true course good?Not learned 1148. What will be the height of tide at Three Mile Harbor Entrance, Gardiners Bay, NY, at 0700 (ZD +5) on 14 Nov 1983?Not learned 1149. Your ship is entering port from sea, and you sight a pair of range lights. When in line, they bear 315° per standard magnetic compass. The chart shows that the range bearing is 312°T, and that variation is 6°W. What is the deviation of your compass at the time of the sighting?Not learned 1150. (5.9.2.3-11) What will be the time after 1000 EST (ZD +5), on 4 March 1983, that the height of the tide at City Island, NY, will be 2.4 feet?Not learned 1151. Two beacons form a range in the direction of 221.5°T. The range is seen in line from your vessel bearing 223° per gyrocompass. The variation in the area is 4°E. What is the error of your gyrocompass?Not learned 1152. What will be the velocity of the tidal current in Bolivar Roads, Texas, at a point 0.5 mile north of Ft. Point, on 23 November 1983 at 0330 CST (ZD +6)?Not learned 1153. Your vessel is proceeding up a channel, and you see a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 311°T, and the variation is 8°E. If the heading of your vessel at the time of the sighting is 305° per standard magnetic compass, what is the correct deviation?Not learned 1154. Your vessel is proceeding down a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 229°T, and variation is 6°W. If the heading of your vessel at the time of the sighting is 232° per standard magnetic compass, what is the deviation?Not learned 1155. Your vessel is steering course 243°psc. Variation for the area is 5°E, and deviation is 2°W. The wind is from the south-southeast, producing a 2° leeway. What true course are you making good?Not learned 1156. You want to transit Hell Gate, NY on 23 July 1983. What is the period of time around the AM (ZD +4) slack before ebb when the current will be less than 0.3 knot?Not learned 1157. What would be the height of the tide at Crisfield, MD, at 0310 DST (ZD +4) on 6 May 1983?Not learned 1158. INLAND ONLY A power-driven vessel operating in a narrow channel with a following current on the Great Lakes or Western Rivers is meeting an upbound vessel. Which statement is TRUE?Not learned 1159. Which installed equipment on a towing vessel must be tested and logged when a new Master assumes command?Not learned 1160. Which statement(s) is/are TRUE concerning radio equipment on towing vessels of 26 feet or more in length?Not learned 1161. What are the quadrantal spheres used for?Not learned 1162. On approaching the English Channel on course 080°T, you note the symbol YBY near a charted buoy. How should you pass this buoy?Not learned 1163. Which of the following is a compass card without north-seeking capability that is used for relative bearings?Not learned 1164. On 10 November 2023 at 0130, you are inbound at Charleston Harbor Entrance Buoy “10” (ACT6611). What is the direction and velocity of the current you are encountering as you pass Buoy “10”Not learned 1165. On 4 October 2023, you will be docking at the Redwood Marine Terminal in Eureka, CA at the first low tide. The berth is located between NOAA reference tidal station #9418767 and subordinate station #9418801. What time (LST) will you be dockingNot learned 1166. On 9 November 2023 at 1130, you are inbound at Charleston Harbor Entrance Buoy “10” (ACT6611). Your vessel will transit 15nm and make good 10.0 knots to a berth where the nearest tidal current station is ACT6706. What will be the direction and velocity of the current as you approach the dockNot learned 1167. Under the IALA cardinal system, a mark with a quick light showing 9 flashes every 15 seconds indicates that the safest water is on which side of the mark?Not learned 1168. Which symbol represents a 20-fathom curve?Not learned 1169. What does the agonic line on an isomagnetic chart indicate?Not learned 1170. On 15 October 2023, you will be docking on the Southern Branch Elizabeth River, VA at the first high tide. The berth is located between NOAA reference tidal station #8638660 and reference station #8639348. What time (LST) will you be dockingNot learned 1171. You are in a channel inbound from sea. A daymark used to mark a channel junction, when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG below?Not learned 1172. Which type of current will have the greatest effect on the course made good for your vessel?Not learned 1173. You are running parallel to the coast and plotting running fixes using bearings of the same object. You are making more speed than assumed for the running fix. In relation to the position indicated by the fix you will be __________.Not learned 1174. How are cumulonimbus clouds formed?Not learned 1175. How is an occluded front represented on a weather map?Not learned 1176. According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northeast wind, where is the center of low pressure located?Not learned 1177. When using GPS, how many theoretical position lines are required for a three-dimensional fix?Not learned 1178. Geographic range is the maximum distance at which a light may be seen under which conditions?Not learned 1179. The luminous range of a light takes into account which factor?Not learned 1180. The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen __________.Not learned