Q402 - Navigation General: Rivers, USCG prep certification 2026

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1. Which type of daymark is used to mark the port side of the channel when entering from sea?Not learned 2. Which would influence a magnetic compass?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 does the abbreviation L.W.R.P. on the navigation maps mean?Not learned 5. Which agency maintains federal aids to navigation?Not learned 6. How are aids to navigation marking the intracoastal waterway (ICW) identified?Not learned 7. An air mass that has moved down from Canada would most likely have which symbols?Not learned 8. When is an air mass termed "warm"?Not learned 9. Which is a characteristic of anticyclones?Not learned 10. What should you apply to a fathometer reading to determine the depth of water?Not learned 11. You are approaching a drawbridge and must pass through during a scheduled closure period. What signal should you sound?Not learned 12. When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance?Not learned 13. You are approaching a multiple-span bridge at night. How is the main navigational channel span indicated?Not learned 14. You are approaching a vertical lift bridge. How do you know when the span is fully open?Not learned 15. What is the approximate geographic range of Point Judith Light, Rhode Island, if your height of eye is 62 feet (18.9 meters)? Refer to "Reprints from the LIGHT LISTS AND COAST PILOTS". (use charted range of 20 miles as nominal range)Not learned 16. 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 17. Which is an area of strong westerly winds occurring between 40°S and 60°S latitude?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. 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 20. To avoid error, how should you read the scale of an aneroid barometer?Not learned 21. Barometers are calibrated at which standard temperature?Not learned 22. What is the basic principle of the magnetic compass?Not learned 23. 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 24. Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.Not learned 25. How are buoys which mark isolated dangers painted?Not learned 26. Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?Not learned 27. Which buoy may be even numbered?Not learned 28. Which buoy may be odd numbered?Not learned 29. Which buoy may be odd numbered?Not learned 30. 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 31. 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 32. Which characteristic and color will a preferred-channel buoy show?Not learned 33. Which is a characteristic of a port side daymark?Not learned 34. 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 35. 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 36. What do chart legends printed in capital letters indicate about the associated landmark?Not learned 37. 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 38. Which clouds is a thin, whitish, high cloud popularly known as "mares' tails"?Not learned 39. 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 40. When cold air displaces warm air, you have which type of front?Not learned 41. What color lights do lighted information markers display?Not learned 42. What is the color scheme of navigational marks used for informational or regulatory purposes?Not learned 43. What color is a triangular daymark?Not learned 44. Which is most commonly associated with fog?Not learned 45. When compared to air temperature, which factor is most useful in predicting fog?Not learned 46. Which condition(s) is(are) necessary for the formation of dew?Not learned 47. Who should be consulted for changing conditions of controlling depths in major channels?Not learned 48. Which defines the controlling depth of the river?Not learned 49. By convention, the Earth's south magnetic pole is which color?Not learned 50. A current moving across a lock entrance toward the river or toward the dam is known by which term?Not learned 51. The most dangerous form of icing encountered at sea is formed by which of the following?Not learned 52. What daymark shape is used in the lateral system?Not learned 53. A daymark used as a special mark is indicated by which letter in illustration D045NG below?Not learned 54. Which describes a deadhead?Not learned 55. Which defines a bold reef?Not learned 56. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 57. Which describes the visible range marked on charts for lights?Not learned 58. What does the description "Racon" beside an illustration on a chart mean?Not learned 59. Deviation in a compass is caused by which of the following?Not learned 60. Which is TRUE concerning the dew point temperature?Not learned 61. What does a Doppler log in the bottom return mode indicate?Not learned 62. When does a Doppler speed log indicate speed over ground?Not learned 63. A Doppler speed log indicates speed through the water __________.Not learned 64. The dry bulb temperature is 78°F and the wet bulb temperature is 62°F. What is the relative humidity?Not learned 65. When a dual-purpose marking is used, how should the mariner following the Intracoastal Waterway be guided?Not learned 66. 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 67. 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 68. When entering from seaward, what does a buoy displaying a composite group (2+1) flashing red light indicate?Not learned 69. Entering from seaward, what do triangular-shaped daymarks mark?Not learned 70. What can be expected with the presence of stratus clouds and a dying wind?Not learned 71. What does the expression "the air is saturated" mean?Not learned 72. What feature(s) of a daymark is (are) used to identify the beacon upon which it is mounted?Not learned 73. Which is a feature of a special daymark?Not learned 74. To find the specific phase characteristic of a lighthouse on a sound of the United States you would use which reference?Not learned 75. Fog forms when which condition exists?Not learned 76. Fog forms when the air temperature is at or below __________.Not learned 77. The following boats are approaching a lock. Which has priority for locking?Not learned 78. 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 79. Which frontal system occurs when a cold air mass and a warm air mass meet, and there is no horizontal motion of either air mass?Not learned 80. What is the function of a red triangular daymark?Not learned 81. Which general weather conditions should you expect to find in a low-pressure system?Not learned 82. Red lights may appear on which buoys?Not learned 83. The height of a light is measured from which reference plane?Not learned 84. 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 85. What does a hygrometer measure?Not learned 86. Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be which color?Not learned 87. 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 88. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?Not learned 89. Under the IALA Buoyage Systems, which is TRUE of the topmark of a red and white vertically-striped buoy?Not learned 90. Under the IALA Buoyage System, which topmark shown in illustration D023NG below will be displayed on a safe watermark?Not learned 91. In the IALA Maritime Buoyage System, what is a red and white vertically-striped buoy used to indicate?Not learned 92. In illustration D039NG below, what type of cloud is indicated by the number one?Not learned 93. In illustration D045NG below, which shape is a daymark warning of danger?Not learned 94. In illustration D045NG below, what two shapes shown are used to indicate a preferred channel?Not learned 95. Which indication on the barometer is most meaningful in forecasting weather?Not learned 96. How is the intensity of a light expressed in the Light Lists?Not learned 97. On an isomagnetic chart, which term is used for the line of zero variation?Not learned 98. Which item in illustration D034NG below shows a flashing light?Not learned 99. 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 100. Which is TRUE of a lateral system buoy displaying a quick flashing light?Not learned 101. 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 102. 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 103. Which light characteristic may be used on a special mark?Not learned 104. Which light characteristic may be used on a special purpose mark?Not learned 105. 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 106. Which term is given to a light that has a light period shorter than its dark period?Not learned 107. The Light List indicates that a dayboard is a type KGW. You should take which action?Not learned 108. 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 109. 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 110. 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 111. What is the light phase characteristic of a lighted isolated-danger mark?Not learned 112. Which light signal indicates that you may approach the lock?Not learned 113. Which would you expect to see on a lighted preferred-channel buoy?Not learned 114. Lighted white and orange buoys must show which color light?Not learned 115. Which list of clouds is in sequence, from highest to lowest in the sky?Not learned 116. At which location is the value of sixty nautical miles per degree of geodetic latitude most correct?Not learned 117. What do the magnets placed in horizontal trays in the compass binnacle compensate for?Not learned 118. Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. Which are the correctors?Not learned 119. 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 120. 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 121. Which measurement uses mean high water as the reference plane?Not learned 122. Mean lower low water is the reference plane used for which measurements?Not learned 123. A mid-channel buoy, may show which light?Not learned 124. On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. What conditions cause this fog?Not learned 125. A mooring buoy, if lighted, shows which color light?Not learned 126. The National Geospatial-Intelligence Agency (formerly the National Imagery and Mapping Agency) would produce a chart of the coast of which area?Not learned 127. The National Oceanic and Atmospheric Administration publishes which item?Not learned 128. On navigational aids, what does the light characteristic "Fl(2+1)" mean?Not learned 129. In North America, which direction do the majority of the weather systems move?Not learned 130. 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 131. If you observe a rapid fall of barometric pressure, which action should you take?Not learned 132. If an observer in the Northern Hemisphere faces the surface wind, where is the center of low pressure located?Not learned 133. When observing a rapid rise in barometric pressure, what may you expect?Not learned 134. When operated over a muddy bottom, a fathometer may indicate which of the following?Not learned 135. You are operating on the Illinois River. Which time of day would Heat thunderstorms most likely develop?Not learned 136. 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 137. 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 138. An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol?Not learned 139. An orange and white buoy with a rectangle on it displays what information?Not learned 140. You are outbound in a buoyed channel on course 015°T. You sight a white light showing a MorseNot learned 141. 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 142. All persons or vessels within the lock area, including the lock approach channels, come under the authority of which person?Not learned 143. 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 144. 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 145. 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 146. "Proceeding from seaward" for the purpose of the direction of buoying offshore, lateral system buoys would be proceeding ________.Not learned 147. Which publication should you check for complete information on Puget Sound weather conditions?Not learned 148. Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Chesapeake Bay?Not learned 149. In which publication could you find information concerning the minimum lighting required for bridges on U.S. waters?Not learned 150. Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?Not learned 151. What is published by the U.S. Coast Guard?Not learned 152. 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 153. Which is TRUE of Radiation fog?Not learned 154. When recording the wind direction in the weather log, which information would you report?Not learned 155. Which is the reference datum used in determining the heights of land features on most charts?Not learned 156. Safe water buoys may show ONLY which type of light?Not learned 157. How is a safe water mark, that can be passed close aboard on either side, painted and lighted?Not learned 158. 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 159. 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 160. 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 161. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 162. A ship is on course 195° at a speed of 15 knots. The apparent wind is from 40° on the port bow, speed 30 knots. What are the direction and speed of the true wind?Not learned 163. What does the shoreline on charts generally represent?Not learned 164. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.Not learned 165. What is a sling psychrometer used to measure?Not learned 166. What does a slow, gradual fall of the barometer indicate?Not learned 167. What does a slow rise in the barometric pressure forecast?Not learned 168. In which source could you find the vertical clearance of a bridge on the Ohio River?Not learned 169. In the Southern Hemisphere winds in a low pressure system rotate in which direction?Not learned 170. Squall lines with an almost unbroken line of threatening dark clouds and sharp changes in wind direction, generally precede which front?Not learned 171. What is the standard atmospheric pressure as measured in inches of mercury?Not learned 172. Which statement concerning the chartlet seen in illustration D010NG below is TRUE? (Soundings and heights are in meters)Not learned 173. Which statement is TRUE for an unlighted, red and green, horizontally-banded buoy with the topmost band red?Not learned 174. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 175. 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 176. 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 177. 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 178. 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 179. Which is TRUE as the temperature of an air mass decreases?Not learned 180. Which is TRUE as the temperature of the air reaches the dew point?Not learned 181. Which is TRUE as the temperature for a given mass of air increases?Not learned 182. Which term defines a submerged dike extending from the bank of the river used to train the channel?Not learned 183. 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 184. Which term is used to describe a generally circular low-pressure area?Not learned 185. Which topmark shown in illustration D023NG below identifies an isolated danger?Not learned 186. Which is TRUE of a bluff bar?Not learned 187. Which is TRUE if the compass error of a magnetic compass has no deviation?Not learned 188. Which is TRUE concerning Hot air?Not learned 189. Which is TRUE concerning the points on the earth's surface where the magnetic dip is 90°?Not learned 190. Which is TRUE of the direction of flow (channel) on the Corps of Engineer's Navigation Maps?Not learned 191. Which is TRUE of echo-sounders?Not learned 192. Which is TRUE of a vertically-striped buoy?Not learned 193. What type of clouds are associated with a cold front?Not learned 194. Which type of daymark is used to mark the starboard side of the channel when entering from sea?Not learned 195. Which type of fog occurs on clear nights with very light breezes and forms when the earth cools rapidly?Not learned 196. Which type of precipitation occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level?Not learned 197. What is typical of warm front weather conditions?Not learned 198. Under the U.S. Aids to Navigation System, which category is a yellow buoy?Not learned 199. In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?Not learned 200. 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 201. 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 202. 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 203. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy?Not learned 204. 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 205. 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 206. In United States waters, a buoy having red and white vertical stripes if lighted, it will have which light characteristic?Not learned 207. 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 208. 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 209. When using an echo sounder in deep water, it is NOT unusual to encounter which situation?Not learned 210. 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 211. How is variation indicated on a small-scale nautical chart?Not learned 212. Your vessel is located at position I on the weather map in illustration D013NG below. You should experience which weather condition?Not learned 213. 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 214. 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 215. 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 216. 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 217. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 218. What does a white buoy with a blue band signify?Not learned 219. White lights may be found on which buoys?Not learned 220. Which wind results from a land mass cooling more quickly at night than an adjacent water area?Not learned 221. On a working copy of a weather map what color is the line that represents a warm front?Not learned 222. Yellow lights may appear on which buoys?Not learned 223. What is the difference between magnetic heading and compass heading called?Not learned 224. 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 225. Which clouds is a thin, whitish, high cloud popularly known as "mares' tails"?Not learned 226. On a working copy of a weather map what color is the line that represents a stationary front?Not learned 227. 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 228. Which item in illustration D034NG below shows a fixed and flashing light?Not learned 229. How is an occluded front represented on a weather map?Not learned