Q204 - Navigation General: Oceans, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. 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 2. 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 3. On 25 December you observe the Sun's lower limb. The sextant altitude (hs) is 4°06.9'. The height of eye is 47-feet and the index error is 1.6' on the arc. The temperature is 19°F and the barometer reads 1030.8 millibars. What is the observed altitude (Ho)?Not learned 4. On 5 July, at 1200 zone time, you cross the 180th meridian steaming westward. What is your local time?Not learned 5. How can the accuracy of an azimuth circle be checked?Not learned 6. What will act to dissipate fog?Not learned 7. Which action is the safest and most prudent procedure to follow while navigating in the vicinity of a tropical cyclone?Not learned 8. What is NOT an advantage of the rhumb line track over a great circle track?Not learned 9. Which aid is NOT marked on a chart with a magenta circle?Not learned 10. An air mass that has moved down from Canada would most likely have which symbols?Not learned 11. Which is TRUE of an alternating light?Not learned 12. Which term is the angle measured eastward from the vernal equinox along the celestial equator often expressed in time units?Not learned 13. Which is another name for Universal time (UTI)?Not learned 14. Which is a characteristic of anticyclones?Not learned 15. Apparent altitude is sextant altitude corrected for __________.Not learned 16. 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 17. The approximate distance to a storm center can be determined by noting the hourly rate of fall of the barometer. If the rate of fall is 0.08 - 0.12 inches, what is the approximate distance to the storm center?Not learned 18. Ascending and descending air masses with different temperatures is part of an important heat transmitting process in our atmosphere. Which term is given to this process?Not learned 19. Which term describes the atmosphere in the vicinity of a high pressure area?Not learned 20. You are attempting to locate your position relative to a hurricane in the Northern Hemisphere. Where is your vessel located if the wind direction remains steady, but with diminishing velocity?Not learned 21. The autumnal equinox is the point where the Sun is at __________.Not learned 22. 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 23. What is the average speed of the movement of a hurricane following the recurvature of its track?Not learned 24. Barometers are calibrated at which standard temperature?Not learned 25. The Benguela Current flows in which direction?Not learned 26. Which of the buoys listed below could be used to mark an anchorage?Not learned 27. Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?Not learned 28. What causes deviation in a magnetic compass?Not learned 29. What causes the error of collimation with regards to the four adjustments to a sextant?Not learned 30. When changing from a compass course to a true course, which should you apply?Not learned 31. Which characteristic and color will a preferred-channel buoy show?Not learned 32. 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 33. 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 34. The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation should you apply?Not learned 35. How is a chart with a natural scale of 1:160,000 classified?Not learned 36. A chart with a scale of 1:80,000 would fall into which category?Not learned 37. 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 38. 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 39. When would cloud formations be minimal?Not learned 40. Which is most commonly associated with fog?Not learned 41. Which condition exists at the summer solstice in the Northern Hemisphere?Not learned 42. By convention, the north pole of a magnet is painted which color?Not learned 43. 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 44. Which correction must be applied to an aneroid barometer reading?Not learned 45. 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 46. You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing?Not learned 47. 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 48. 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 49. You are on course 238°T. To check the course of your vessel you should observe a celestial body on which bearing?Not learned 50. You are on course 303°T. To check the speed of your vessel you should observe a celestial body on which bearing?Not learned 51. Which of the following should be done when crossing the magnetic equator?Not learned 52. When does a current perpendicular to a vessel's track have the greatest effect on the vessel's course made good?Not learned 53. Which current is responsible for the movement of large quantities of ice into the North Atlantic shipping lanes?Not learned 54. The most dangerous form of icing encountered at sea is formed by which of the following?Not learned 55. Which term is used to describe the database information that should be shown when a chart is first displayed on ECDIS?Not learned 56. 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 57. Which daymark has no lateral significance?Not learned 58. Which is TRUE of a dead reckoning (DR) plot?Not learned 59. The range of tide is the __________.Not learned 60. Which defines the term relative humidity?Not learned 61. Which describes the level of database information which cannot be removed from the ECDIS display and consists of information which is required at all times in all geographic areas and under all circumstances?Not learned 62. Which describes the result when you turn on the fast time constant (differentiator) control of a radar?Not learned 63. Which describes the visible range marked on charts for lights?Not learned 64. The dew point is reached when which condition occurs?Not learned 65. Which is the difference between the DR position and a fix, both of which have the same time?Not learned 66. The direction in which a vessel is steered is the course. The path actually followed is the __________.Not learned 67. Which is the dividing meridian between zone descriptions -10 and -11?Not learned 68. The dry bulb temperature is 78°F and the wet bulb temperature is 62°F. What is the relative humidity?Not learned 69. The ECDIS must have the capability to preserve the record of the voyage track. How many hours of the previous track are required to be maintained?Not learned 70. When does the effects of priming of the tides occur?Not learned 71. 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 72. 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 73. 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 74. 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 75. 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 76. You are enroute from Puerto Rico to New York. A hurricane makes up and is approaching. What does it indicate if the wind veers steadily?Not learned 77. You are entering an African port and see ahead of you a red can-shaped buoy. What action should you take?Not learned 78. What is the equivalent of 10 min. 52 sec. in arc units?Not learned 79. What is the equivalent of 37 min. 32 sec. in arc units?Not learned 80. The error in a sextant altitude caused by refraction is greatest when the celestial body is in which location?Not learned 81. What does the expression "the air is saturated" mean?Not learned 82. What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?Not learned 83. Which feature, when set to zero, might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability?Not learned 84. You will find daily information about the duration of slack water in a port on the Atlantic Coast in which publication?Not learned 85. Where do you find the semidiameter correction to be used to correct sextant observations of the stars?Not learned 86. Which can you use to indicate the bearing of the center of a hurricane or tropical storm?Not learned 87. Which is TRUE concerning a first magnitude star?Not learned 88. Which of the following describes gyrocompass repeaters which reproduce the indications of the master gyrocompass?Not learned 89. Which of the following is the reference point to measure an azimuth angle for a body?Not learned 90. Which of the following statements is TRUE regarding automatic identification systems (AIS)?Not learned 91. 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 92. The GMT is 0445 and your zone description is +1. What is your zone time?Not learned 93. At about GMT 1436, on 3 December, the lower limb of the Moon is observed with a sextant having an index error of 2.5' on the arc. The height of eye is 32 feet. The sextant altitude (hs) is 3°38.8'. What is the observed altitude?Not learned 94. The GP of a body for a high-altitude sight is determined from the declination and which other information?Not learned 95. A great circle crosses the equator at 141°E. It will also cross the equator at what other longitude?Not learned 96. A great circle will intersect the equator at how many degrees of longitude apart?Not learned 97. A green buoy has a yellow triangle on it. What type of buoy is this?Not learned 98. 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 99. You are heading in a northerly direction when you come across an easterly current. Your vessel will respond in which manner?Not learned 100. 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 101. In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.Not learned 102. Which is TRUE when a high pressure system is centered north of your vessel in the Northern Hemisphere?Not learned 103. The highest frequency of tropical cyclones in the North Atlantic Ocean occurs during which time frame?Not learned 104. In the horizon system of coordinates what is equivalent to the declination of the equator system?Not learned 105. In the horizon system of coordinates what is equivalent to the equator on the Earth?Not learned 106. In the horizon system of coordinates what is equivalent to the poles on the Earth?Not learned 107. A HYDROLANT warning would normally be sent for all of the following EXCEPT __________.Not learned 108. 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 109. Under the IALA - A Buoyage System, a buoy used as a port hand mark would not show which light characteristic?Not learned 110. Under the IALA-A Buoyage System, when entering from seaward which buoy as shown in illustration D046NG below, should be left to starboard?Not learned 111. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?Not learned 112. 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 113. 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 114. In illustration D045NG below, which shape is a daymark warning of danger?Not learned 115. An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle?Not learned 116. What is the primary cause of index error of a sextant?Not learned 117. What indicates the arrival of a hurricane within 24 to 36 hours?Not learned 118. By what means are indications of the master gyrocompass sent to remote repeaters?Not learned 119. 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 120. What information is found in the chart title?Not learned 121. Which item contains information about temporary, short-term changes affecting the safety of navigation in U.S. waters?Not learned 122. Where can information for updating paper nautical charts primarily be found?Not learned 123. How are you informed of defects or changes in aids to navigation?Not learned 124. You have been informed that dredging operations may be underway in your vicinity. Which buoy indicates the dredging area?Not learned 125. The initial great circle course angle between LAT 23°00'S, LONG 42°00'W and LAT 34°00'S, LONG 18°00'E is 063.8°. What is the true course?Not learned 126. Which item in illustration D034NG below shows a MorseNot learned 127. 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 128. Which is TRUE concerning Light Lists for coastal waters?Not learned 129. What is the light phase characteristic of a lighted isolated-danger mark?Not learned 130. Lighted white and orange buoys must show which color light?Not learned 131. The line of position determined from a sight with an observed altitude (Ho) of 88°45.0' should be __________.Not learned 132. Which of the listed properties does warm air possess?Not learned 133. Some locations maintain a zone time of -13. What are the Greenwich time and date if the zone time and date are 0152, 10 January?Not learned 134. Your longitude is 179°59'W. The LMT at this longitude is 23h 56m on the 4th day of the month. Six minutes later, your position is 179°59'E longitude. What is your LMT and date?Not learned 135. Why are low altitude sun sights not generally used?Not learned 136. At the magnetic equator there is no induced magnetism in the vertical soft iron because __________.Not learned 137. Which term is given to magnetism which is present only when the material is under the influence of an external field?Not learned 138. The magnitude of three stars is indicated. Which star is the brightest?Not learned 139. What is the major problem with taking high altitude sun observations?Not learned 140. 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 141. What is the maximum difference between mean time and apparent time?Not learned 142. 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 143. Which measurement uses mean high water as the reference plane?Not learned 144. The measurement of local time is based on the passage of the Sun over the __________.Not learned 145. 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 146. In which months will the North Equatorial Countercurrent be strongest?Not learned 147. The Moon is farthest from the Earth at __________.Not learned 148. When is the Moon nearest to the Earth?Not learned 149. The National Geospatial-Intelligence Agency (formerly the National Imagery and Mapping Agency) would produce a chart of the coast of which area?Not learned 150. Which Naval Control of Shipping publication should be aboard your vessel?Not learned 151. A NAVAREA warning carries the following number: 1986/87 (11). Which statement is TRUE?Not learned 152. 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 153. How is a navigation light identified on an Army Corps of Engineers navigation map?Not learned 154. The navigational triangle uses parts of two systems of coordinates, one of which is the celestial equator system, which is the other system?Not learned 155. When do neap tides occur?Not learned 156. What is a nonadjustable error of the sextant?Not learned 157. 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 158. In the Northern Hemisphere, swells that have outrun the storm are produced in which location?Not learned 159. If you observe a rapid fall of barometric pressure, which action should you take?Not learned 160. When observing a rapid rise in barometric pressure, what may you expect?Not learned 161. Which is TRUE of an occulting light?Not learned 162. What occurs when rising air cools to the dew point?Not learned 163. 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 164. Which ocean current is "warm" based on the latitude in which it originates and on the effect it has on climate?Not learned 165. On what does the operation of an aneroid barometer depend?Not learned 166. In order for a star to be used for a sight at lower transit, which must be TRUE of the star?Not learned 167. 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 168. When is the planet Mars not visible to us?Not learned 169. Planetary aberration is due, in part, to __________.Not learned 170. You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?Not learned 171. 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 172. Which term is given to the points where the Sun is at 0° declination?Not learned 173. 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 174. Your present weather is sunny with a steady barometer. A low swell approaches your vessel from the south with crests passing at relatively long periods of about four per minute. What does this usually indicate?Not learned 175. When do the prevailing westerlies of the Southern Hemisphere blow 17-27 knots?Not learned 176. 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 177. 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 178. Which publication indicates the HYDROLANTS or HYDROPACS issued since the previous working day?Not learned 179. Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?Not learned 180. 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 181. Which is TRUE of Radiation fog?Not learned 182. The radius of a circle of equal altitude of a body is equal to the __________.Not learned 183. Which is TRUE of Raster-scan chart data?Not learned 184. After the recurvature of a hurricane's track, which describes the result of its forward speed?Not learned 185. In regions near the poles, how are the winds generally described?Not learned 186. 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 187. When is a revised print of a chart made?Not learned 188. 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 189. A rotary current sets through all directions of the compass. How much time does it take to complete one of these cycles, in a locale off the East coast of the U.S.?Not learned 190. 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 191. How is a safe water mark, that can be passed close aboard on either side, painted and lighted?Not learned 192. 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 193. 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 194. Severe tropical cyclones (hurricanes, typhoons) occur in all warm-water oceans except the __________.Not learned 195. If a ship is proceeding towards the magnetic equator, which is TRUE concerning the uncorrected deviation due to permanent magnetism?Not learned 196. What does the shoreline on charts generally represent?Not learned 197. Sidereal time is used by navigators when __________.Not learned 198. You sight a spar buoy with the topmark shown in illustration D027NG below. You must take which of the following actions?Not learned 199. What does a single barometric pressure reading of 28.60 indicate?Not learned 200. What does a slow rise in the barometric pressure forecast?Not learned 201. 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 202. As the South Equatorial Current approaches the east coast of Africa, it divides with the main part flowing south to form which current?Not learned 203. A special mark (yellow buoy), if lighted, may exhibit which light rhythm?Not learned 204. Which term is used to describe the speed at which an ocean wave system advances?Not learned 205. Spring tides occur __________.Not learned 206. "Stand" of the tide is that time when __________.Not learned 207. Which is the standard meridian for the time zone +1?Not learned 208. What is the standard time meridian for description +12?Not learned 209. The Star Lists in the Nautical Almanac are based on which of the following magnitudes?Not learned 210. A star is observed at lower transit. Which is TRUE concerning the line of position derived from this sight?Not learned 211. Which statement concerning the chartlet seen in illustration D010NG below is TRUE? (Soundings and heights are in meters)Not learned 212. Which statement about gyrocompass error is TRUE?Not learned 213. Which statement about radio navigational warnings is TRUE?Not learned 214. Which statement is TRUE concerning the current of the Gulf Stream?Not learned 215. Which statement is TRUE concerning a Mercator projection?Not learned 216. 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 217. 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 218. 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 219. 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 220. 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 221. 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 222. You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 039°. PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 210.0° 204° 239.5° 234° 269.0° 264° 298.0° 294° 327.5° 324° 358.5° 354°Not learned 223. You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a magnetic compass heading of 166°. PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 239.5° 234° 269.0° 264° 210.0° 204° 298.0° 294° 327.5° 324° 358.5° 354°Not learned 224. A sylphon cell is a part of which instrument?Not learned 225. You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?Not learned 226. You take a bearing of 264° of a lighthouse. What bearing of another object would give the best fix?Not learned 227. Which term is given to the dense black cumulonimbus clouds surrounding the eye of a hurricane?Not learned 228. Which is the term given to the time required for a lighted aid to complete a full cycle of light changes?Not learned 229. Which is TRUE of the tides in Boston Harbor?Not learned 230. The total magnetic effects which cause deviation of a vessel's compass can be broken down into a series of components which are given which term?Not learned 231. Which is TRUE concerning the speed of sound in water?Not learned 232. The true course between two points is 312°. Your gyrocompass has an error of 3°W. You make an allowance of 4° leeway for a west by south wind. What gyro course should be steered to make the true course good?Not learned 233. Which is TRUE of the dangerous semicircle of a hurricane in the Northern Hemisphere?Not learned 234. Which is TRUE why Tropical cyclones do not form within 5° of the Equator?Not learned 235. Which is TRUE when using the radar for navigation?Not learned 236. 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 237. Which type of cloud is hail most likely to fall from?Not learned 238. The type of current which will have the greatest effect on the course made good for your vessel is __________.Not learned 239. Which type of GPS receiver has at least four channels to process information from several satellites simultaneously?Not learned 240. Which type of precipitation is a product of the violent convection in thunderstorms?Not learned 241. In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?Not learned 242. 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 243. 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 244. The upper vertex of a great circle track is in LONG 156°00'E. Sailing eastward, the great circle track will cross the equator in which LONG?Not learned 245. When using horizontal sextant angles of three objects to fix your position, an indeterminate position will result in which situation?Not learned 246. When using a radar in an unstabilized mode, fixes are determined most easily from __________.Not learned 247. 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 248. 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 249. 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 250. Your vessel is on course 093°T at 15 knots. At 1835 a light bears 136°T, and at 1857 the same light bears 170°T. What was your distance off the light at 1857?Not learned 251. Your vessel is located at position I on the weather map in illustration D013NG below. You should experience which weather condition?Not learned 252. 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 253. 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 254. 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 255. Your vessel is steering 096°T at 17 knots. At 1847 a light bears 057°T, and at 1916 the same light bears 033°T. What will be your distance off abeam?Not learned 256. Your vessel is steering course 299°psc, variation for the area is 7°W, and deviation is 4°W. The wind is from the southwest, producing a 3° leeway. What true course are you making good?Not learned 257. Your vessel is steering course 352°psc, variation for the area is 11°E, and deviation is 9°W. The wind is from the northeast, producing a 1° leeway. What true course are you making good?Not learned 258. 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 259. On a voyage from Halifax, N.S., to Dakar, West Africa, the Canary Current will __________.Not learned 260. When a warm air mass is adjacent to a cold air mass, the separation line between the two is called a(n) __________.Not learned 261. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 262. For a well-made and well-maintained sextant, the maximum value of which correction is usually so small that it can be ignored?Not learned 263. Where is the West Wind Drift located?Not learned 264. What does a white buoy with an open-faced orange diamond on it indicate?Not learned 265. Which winds have the greatest effect on the set, drift, and depth of the equatorial currents?Not learned 266. The winds of the "roaring forties" are strongest near which latitude?Not learned 267. Why is the wind velocity higher in the dangerous semicircle of a tropical cyclone?Not learned 268. During the winter months, which is TRUE of the southeast trade winds?Not learned 269. 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 270. In working out a local apparent noon sight for your latitude, you subtract the Ho from 90°. The 90° represents the angular distance from __________.Not learned 271. Where would you expect to find channels marked with the IALA-A Buoyage System?Not learned 272. Where would you obtain data on currents for areas of the world not covered by the U.S. National Ocean Service?Not learned 273. Yesterday your chronometer read 03h 01m 56s at the 1500 GMT time tick. Today your chronometer read 03h 01m 58s at the 1500 GMT time tick. What is the chronometer error?Not learned 274. Yesterday you took a time tick using the 1200 GMT broadcast, and the chronometer read 11h 59m 59s. Today at the 1200 GMT time tick the chronometer read 00h 00m 01s. What is the chronometer error?Not learned 275. The zenith is the point on the celestial sphere that is __________.Not learned 276. While proceeding up a channel on course 010° per gyrocompass, you notice a pair of range lights in alignment with the masts of your vessel when viewed forward. A check of the chart shows the range to be 009°T and the variation to be 15°W. If the ship's course is 026°psc, what is the deviation for the present heading?Not learned 277. You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2° W. The variation is 8° W. Find the deviation on a magnetic compass heading of 210°. PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 210.0° 204° 239.5° 234° 269.0° 264° 298.0° 294° 327.5° 324° 358.5° 354°Not learned 278. You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 058°.Not learned 279. You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a true heading of 319°.Not learned 280. 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 281. You are underway and intend to make good a course of 350°T. You experience a current with a set and drift of 070°T at 1.5 knots, and a westerly wind produces a leeway of 4°. You adjust your course to compensate for the current and leeway, while maintaining an engine speed of 10 knots. What will be your speed made good over your intended course of 350°T?Not learned 282. The vessel's course is 116°psc, the variation for the locality is 25°W and the deviation is 6°W. What is the true course made good if a northerly wind produces 1° leeway?Not learned 283. 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 284. 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 285. Under the IALA-A Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which topmark shown in illustration D046NG below?Not learned 286. You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°E. The variation is 8°W. Find the deviation on a magnetic compass heading of 234°.Not learned 287. You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a magnetic compass heading of 004°. PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 239.5° 234° 269.0° 264° 210.0° 204° 298.0° 294° 327.5° 324° 358.5° 354°Not learned 288. The chart of a beach area shows a very flat slope to the underwater beach bottom. What type of breakers can be expected when trying to land a boat on this beach?Not learned 289. Which type of current will have the greatest effect on the course made good for your vessel?Not learned 290. 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 291. The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel under which circumstances?Not learned 292. Under the IALA-A Buoyage System, when entering from seaward which buoy as shown in illustration D046NG below, should be left to port?Not learned 293. When is the Moon farthest from the Earth?Not learned