Q397 - Navigation General: Rivers, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Which type of daymark is used to mark the port side of the channel when entering from sea?Not learned 2. 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 3. What does the abbreviation L.W.R.P. on the navigation maps mean?Not learned 4. Advection fog is most commonly caused by __________.Not learned 5. Which agency maintains federal aids to navigation?Not learned 6. When is an air mass termed "warm"?Not learned 7. Which is a characteristic of anticyclones?Not learned 8. What should you apply to a fathometer reading to determine the depth of water?Not learned 9. You are approaching a drawbridge and must pass through during a scheduled closure period. What signal should you sound?Not learned 10. 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 11. You are approaching a vertical lift bridge. How do you know when the span is fully open?Not learned 12. What is the approximate geographic range of Southwest Ledge Light, Connecticut, if your height of eye is 32 feet (9.8 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS".Not learned 13. Which is an area of strong westerly winds occurring between 40°S and 60°S latitude?Not learned 14. 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 15. 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 16. To avoid error, how should you read the scale of an aneroid barometer?Not learned 17. A backlash below a lock is defined as __________.Not learned 18. What is the basic principle of the magnetic compass?Not learned 19. A bridge over a navigable waterway is being repaired. There is a traveler platform under the bridge's deck that significantly reduces the vertical clearance. If required by the CG district commander, how will this be indicated at night?Not learned 20. Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.Not learned 21. Buoys which mark dredging areas are painted which color?Not learned 22. How are buoys which mark isolated dangers painted?Not learned 23. Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?Not learned 24. Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?Not learned 25. Which buoy may be even numbered?Not learned 26. Which buoy may be odd numbered?Not learned 27. 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 28. The buoy symbol printed on your chart is leaning to the northeast. What does this indicate?Not learned 29. 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 30. Which characteristic and color will a preferred-channel buoy show?Not learned 31. 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 32. How are chart legends which indicate a conspicuous landmark printed?Not learned 33. What do chart legends printed in capital letters indicate about the associated landmark?Not learned 34. What do clearance gauges at bridges indicate?Not learned 35. When would cloud formations be minimal?Not learned 36. Which clouds is a thin, whitish, high cloud popularly known as "mares' tails"?Not learned 37. 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 38. When cold air displaces warm air, you have which type of front?Not learned 39. As a cold front passes how do the pressure and the winds change?Not learned 40. What color lights do lighted information markers display?Not learned 41. What color is a triangular daymark?Not learned 42. Which is most commonly associated with fog?Not learned 43. When compared to air temperature, which factor is most useful in predicting fog?Not learned 44. Which of the following compensates for errors introduced when a vessel heels over?Not learned 45. Which condition(s) is(are) necessary for the formation of dew?Not learned 46. Who should be consulted for changing conditions of controlling depths in major channels?Not learned 47. By convention, the Earth's south magnetic pole is which color?Not learned 48. A current moving across a lock entrance toward the river or toward the dam is known by which term?Not learned 49. The most dangerous form of icing encountered at sea is formed by which of the following?Not learned 50. A daymark used as a special mark is indicated by which letter in illustration D045NG below?Not learned 51. Which describes a deadhead?Not learned 52. Which defines a bold reef?Not learned 53. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 54. Which describes the visible range marked on charts for lights?Not learned 55. What does the description "Racon" beside an illustration on a chart mean?Not learned 56. Which is TRUE concerning the dew point temperature?Not learned 57. What does a Doppler log in the bottom return mode indicate?Not learned 58. When does a Doppler speed log indicate speed over ground?Not learned 59. A Doppler speed log indicates speed through the water __________.Not learned 60. The dry bulb temperature is 78°F and the wet bulb temperature is 62°F. What is the relative humidity?Not learned 61. 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 62. When entering from seaward, what does a buoy displaying a composite group (2+1) flashing red light indicate?Not learned 63. Entering from seaward, what do triangular-shaped daymarks mark?Not learned 64. What can be expected with the presence of stratus clouds and a dying wind?Not learned 65. What does the expression "the air is saturated" mean?Not learned 66. What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?Not learned 67. Which is a feature of a special daymark?Not learned 68. To find the specific phase characteristic of a lighthouse on a sound of the United States you would use which reference?Not learned 69. Fog forms when the air temperature is at or below __________.Not learned 70. Fog generally clears when the __________.Not learned 71. The following boats are approaching a lock. Which has priority for locking?Not learned 72. 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 73. What is the function of a red triangular daymark?Not learned 74. A green buoy has a yellow triangle on it. What type of buoy is this?Not learned 75. Red lights may appear on which buoys?Not learned 76. The height of a light is measured from which reference plane?Not learned 77. What is the term used for the horizontal angle between the magnetic meridian and the north-south line axis line of the magnetic compass?Not learned 78. What does a hygrometer measure?Not learned 79. Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be which color?Not learned 80. 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 81. Under the IALA Buoyage Systems, which is TRUE of the topmark of a red and white vertically-striped buoy?Not learned 82. Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?Not learned 83. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate?Not learned 84. In illustration D039NG below, what type of cloud is indicated by the number one?Not learned 85. In illustration D045NG below, which shape is a daymark warning of danger?Not learned 86. In illustration D045NG below, what two shapes shown are used to indicate a preferred channel?Not learned 87. Which indication on the barometer is most meaningful in forecasting weather?Not learned 88. Which information is found in the chart title?Not learned 89. An instrument designed to maintain a continuous record of atmospheric pressure is a(n) __________.Not learned 90. On an isomagnetic chart, which term is used for the line of zero variation?Not learned 91. Which item in illustration D034NG below shows a flashing light?Not learned 92. 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 93. Which is TRUE of a lateral system buoy displaying a quick flashing light?Not learned 94. What is the length of a nautical mile?Not learned 95. 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 96. 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 97. Which light characteristic may be used on a special mark?Not learned 98. Which light characteristic may be used on a special purpose mark?Not learned 99. 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 100. Which is TRUE concerning Light Lists for coastal waters?Not learned 101. The Light List indicates that a dayboard is a type MR. You should take which action?Not learned 102. The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?Not learned 103. The Light List shows a lighted aid to navigation on the right bank. In which situation can the light be seen on the port side of a vessel?Not learned 104. The Light List shows that a navigational light has a nominal range of 12 miles and a height above water of 25 feet (7.6 meters). Your height of eye is 38 feet (11.6 meters) and the visibility is 5.5 miles. At what approximate range will you FIRST sight the light?Not learned 105. Which would you expect to see on a lighted preferred-channel buoy?Not learned 106. Lighted white and orange buoys must show which color light?Not learned 107. Which list of clouds is in sequence, from highest to lowest in the sky?Not learned 108. At which location is the value of sixty nautical miles per degree of geodetic latitude most correct?Not learned 109. What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?Not learned 110. 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 111. What is magnetic dip a measurement of?Not learned 112. Which measurement uses mean high water as the reference plane?Not learned 113. Which is TRUE of mean high water?Not learned 114. Mean lower low water is the reference plane used for which measurements?Not learned 115. A mid-channel buoy, may show which light?Not learned 116. On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. What conditions cause this fog?Not learned 117. A mooring buoy, if lighted, shows which color light?Not learned 118. A mountain peak charted at 700 feet breaks the horizon, and your height of eye is 12 feet. What is your approximate distance off (choose closest answer)?Not learned 119. The National Geospatial-Intelligence Agency (formerly the National Imagery and Mapping Agency) would produce a chart of the coast of which area?Not learned 120. The National Oceanic and Atmospheric Administration publishes which item?Not learned 121. The navigation regulations applicable to a U.S. inland waterway can be found in which publication?Not learned 122. On navigational aids, what does the light characteristic "Fl(2+1)" mean?Not learned 123. Which navigational mark may only be lettered?Not learned 124. In North America, which direction do the majority of the weather systems move?Not learned 125. In the Northern Hemisphere, when the center of a high-pressure system is due east of your position, you can expect winds from which direction?Not learned 126. How can Northern right whales can be identified?Not learned 127. If you observe a rapid fall of barometric pressure, which action should you take?Not learned 128. If an observer in the Northern Hemisphere faces the surface wind, where is the center of low pressure located?Not learned 129. When observing a rapid rise in barometric pressure, what may you expect?Not learned 130. When operated over a muddy bottom, a fathometer may indicate which of the following?Not learned 131. You are operating on the Illinois River. Which time of day would Heat thunderstorms most likely develop?Not learned 132. You are operating on the Red River Waterway, a cold front has passed and your vessel is in the cold sector. What wind conditions would you expect at your vessel?Not learned 133. You are operating on the Red River Waterway, a warm front has passed and your vessel is in the warm sector. What wind conditions would you expect at your vessel?Not learned 134. An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?Not learned 135. An orange and white buoy marking an area where operating restrictions are in effect will be marked with which symbol?Not learned 136. An orange and white buoy with a rectangle on it displays what information?Not learned 137. 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 138. All persons or vessels within the lock area, including the lock approach channels, come under the authority of which person?Not learned 139. 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 140. 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 141. 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 142. "Proceeding from seaward" for the purpose of the direction of buoying offshore, lateral system buoys would be proceeding ________.Not learned 143. Which publication should you check for complete information on Puget Sound weather conditions?Not learned 144. Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Chesapeake Bay?Not learned 145. Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?Not learned 146. What is published by the U.S. Coast Guard?Not learned 147. 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 148. When recording the wind direction in the weather log, which information would you report?Not learned 149. Which is the reference datum used in determining the heights of land features on most charts?Not learned 150. Safe water buoys may show ONLY which type of light?Not learned 151. How is a safe water mark, that can be passed close aboard on either side, painted and lighted?Not learned 152. 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 153. 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 154. 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 155. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 156. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.Not learned 157. What is a sling psychrometer used to measure?Not learned 158. What does a slow, gradual fall of the barometer indicate?Not learned 159. What does a slow rise in the barometric pressure forecast?Not learned 160. In which source could you find the vertical clearance of a bridge on the Ohio River?Not learned 161. In the Southern Hemisphere winds in a low pressure system rotate in which direction?Not learned 162. Squall lines with an almost unbroken line of threatening dark clouds and sharp changes in wind direction, generally precede which front?Not learned 163. What is the standard atmospheric pressure in millibars?Not learned 164. Which statement is TRUE for an unlighted, red and green, horizontally-banded buoy with the topmost band red?Not learned 165. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 166. 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 167. 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 168. 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 169. 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 170. A sylphon cell is a part of which instrument?Not learned 171. Which of the symbols shown in illustration D018NG below represents an occluded front?Not learned 172. Which is TRUE as the temperature of the air reaches the dew point?Not learned 173. Which is TRUE as the temperature for a given mass of air increases?Not learned 174. Temperature and moisture characteristics are modified in a warm or cold air mass due to which factor?Not learned 175. Which term defines a submerged dike extending from the bank of the river used to train the channel?Not learned 176. 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 177. Which term is used to describe a generally circular low-pressure area?Not learned 178. Which topmark shown in illustration D023NG below identifies an isolated danger?Not learned 179. Which is TRUE of a bluff bar?Not learned 180. Which is TRUE if the compass error of a magnetic compass has no deviation?Not learned 181. Which is TRUE concerning Hot air?Not learned 182. Which is TRUE concerning the points on the earth's surface where the magnetic dip is 90°?Not learned 183. Which is TRUE of the direction of flow (channel) on the Corps of Engineer's Navigation Maps?Not learned 184. Which is TRUE of echo-sounders?Not learned 185. Which is TRUE of a vertically-striped buoy?Not learned 186. What type of clouds are associated with a cold front?Not learned 187. Which type of cloud is the classic "thunderhead"?Not learned 188. Which type of daymark is used to mark the starboard side of the channel when entering from sea?Not learned 189. Which type of fog occurs on clear nights with very light breezes and forms when the earth cools rapidly?Not learned 190. Which type of precipitation occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level?Not learned 191. What is typical of warm front weather conditions?Not learned 192. Under the U.S. Aids to Navigation System, which category is a yellow buoy?Not learned 193. In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?Not learned 194. 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 195. 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 196. 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 197. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the right descending bank?Not learned 198. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy?Not learned 199. 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 200. 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 201. Under the Uniform State Waterway Marking System how is a mooring buoy painted?Not learned 202. 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 203. 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 204. 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 205. When utilizing a Pacific Coast chart, which is the reference plane of soundings?Not learned 206. How is variation indicated on a small-scale nautical chart?Not learned 207. Your vessel is on course 150°T, speed 17 knots. The apparent wind is from 40° off the starboard bow, speed 15 knots. What is the speed of the true wind?Not learned 208. Your vessel is on course 270°T, speed 10 knots. The apparent wind is from 10° off the port bow, speed 30 knots. From which direction is the true wind?Not learned 209. Your vessel is located at position I on the weather map in illustration D013NG below. You should experience which weather condition?Not learned 210. 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 211. 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 212. 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 213. As a warm front approaches how does barometric pressure change?Not learned 214. While on watch, you notice that the air temperature is dropping and is approaching the dew point. Which type of weather should be forecasted?Not learned 215. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 216. Weather systems in the middle latitudes generally travel in which direction?Not learned 217. What does a white buoy with a blue band signify?Not learned 218. On a working copy of a weather map, a cold front is represented by what color line?Not learned 219. Yellow lights may appear on which buoys?Not learned 220. What is the difference between magnetic heading and compass heading called?Not learned 221. 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 222. Which clouds is a thin, whitish, high cloud popularly known as "mares' tails"?Not learned 223. 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 224. Which item in illustration D034NG below shows a fixed and flashing light?Not learned 225. Which instrument is designed to maintain a continuous record of atmospheric pressure?Not learned