Q388 - Navigation General: Rivers, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Which would influence a magnetic compass?Not learned 2. What does the abbreviation L.W.R.P. on the navigation maps mean?Not learned 3. What will act to dissipate fog?Not learned 4. Advection fog is most commonly caused by __________.Not learned 5. Which agency maintains federal aids to navigation?Not learned 6. Which agency publishes the Light Lists?Not learned 7. How are aids to navigation marking the intracoastal waterway (ICW) identified?Not learned 8. Which is a characteristic of anticyclones?Not learned 9. What should you apply to a fathometer reading to determine the depth of water?Not learned 10. You are approaching a drawbridge and must pass through during a scheduled closure period. What signal should you sound?Not learned 11. You are approaching the first of two drawbridges that span a narrow channel. The second drawbridge is close to the first. Which signals should you sound?Not learned 12. When approaching a lock and at a distance of not more than a mile, vessels desiring a single lockage shall sound which signal?Not learned 13. You are approaching a lock and see a flashing amber light located on the lock wall. Which action should you take?Not learned 14. You are approaching a vertical lift bridge. How do you know when the span is fully open?Not learned 15. On an Army Corps of Engineers navigation map, how is each mile A.H.P. on the Lower Mississippi River marked?Not learned 16. 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 17. 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 18. Which are associated with Cumulonimbus clouds?Not learned 19. A backlash below a lock is defined as __________.Not learned 20. Barometers are calibrated at which standard temperature?Not learned 21. A bluff bar is a bar __________.Not learned 22. Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.Not learned 23. Where are buoys and day beacons exhibiting a yellow triangle or square painted on them used?Not learned 24. Buoys which mark dredging areas are painted which color?Not learned 25. How are buoys which mark isolated dangers painted?Not learned 26. Buoys are marked with reflective material to assist in their detection by searchlight. Which statement is TRUE?Not learned 27. A buoy marking a wreck will show a(n) __________.Not learned 28. Which buoy may be odd numbered?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 is a characteristic of warm air masses?Not learned 31. On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. Which is TRUE of the red sector?Not learned 32. On charts of U.S. waters, a magenta marking is NOT used for marking a __________.Not learned 33. Under which circumstances is the dumping of refuse in a lock permitted?Not learned 34. 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 35. What color lights do lighted information markers display?Not learned 36. What are the colors of a mid-channel daymark?Not learned 37. What is a common unit of measure for atmospheric pressure?Not learned 38. Which is the most commonly encountered fog at sea?Not learned 39. When compared to air temperature, which factor is most useful in predicting fog?Not learned 40. Which is TRUE if the compass heading and the magnetic heading are the same?Not learned 41. Which condition(s) is(are) necessary for the formation of dew?Not learned 42. Which condition would most likely result in fog?Not learned 43. Who should be consulted for changing conditions of controlling depths in major channels?Not learned 44. Which defines the controlling depth of the river?Not learned 45. By convention, what color is the south pole of a magnet painted?Not learned 46. A current moving across a lock entrance toward the river or toward the dam is known by which term?Not learned 47. The datum from which the predicted heights of tides are reckoned in the tide tables is __________.Not learned 48. What daymark has NO lateral significance?Not learned 49. Which daymark has no lateral significance?Not learned 50. A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below?Not learned 51. A daymark used to indicate the starboard side of the channel when approaching from seaward will have the shape indicated by what letter in illustration D045NG below?Not learned 52. A daymark used as a special mark is indicated by which letter in illustration D045NG below?Not learned 53. Which describes a deadhead?Not learned 54. Which defines a bold reef?Not learned 55. Which defines the term relative humidity?Not learned 56. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 57. Deviation is the angle between the __________.Not learned 58. The dew point is reached when which condition occurs?Not learned 59. What does a Doppler log in the bottom return mode indicate?Not learned 60. A Doppler log in the volume reverberation mode indicates __________.Not learned 61. When does a Doppler speed log indicate speed over ground?Not learned 62. How is the draw span of a floating drawbridge marked?Not learned 63. A drawbridge may use visual signals to acknowledge a vessel's request to open the draw. Which signal indicates that the draw will NOT be opened immediately?Not learned 64. The dry bulb temperature is 38° F (3.3° C) and the wet bulb temperature is 29° F (-1.7° C). What is the relative humidity?Not learned 65. The dry-bulb temperature is 78°F (26°C) and the wet-bulb temperature is 68°F (20°C). What is the relative humidity?Not learned 66. What enables you to estimate the bearing of a storm's center?Not learned 67. You are enroute to Sioux City, Iowa on the Missouri River. When would you most likely encounter a frontal thunderstorm?Not learned 68. 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 69. 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 70. What can be expected with the presence of stratus clouds and a dying wind?Not learned 71. Which is a feature of a special daymark?Not learned 72. Fog generally clears when the __________.Not learned 73. Which fog is produced by warm moist air passing over a cold surface?Not learned 74. Which of the following is associated with consistently high barometric pressure?Not learned 75. Which of the following is a boundary between two air masses?Not learned 76. Which form of cloud, that is often known as "mackerel sky", is generally associated with fair weather?Not learned 77. What is the function of a red triangular daymark?Not learned 78. Red lights may appear on which buoys?Not learned 79. Which is TRUE when a high pressure system is centered north of your vessel in the Northern Hemisphere?Not learned 80. You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should take which action?Not learned 81. Under the IALA-A and B Buoyage Systems, what does a buoy with alternating red and white vertical stripes indicate?Not learned 82. Under the IALA-B Buoyage System, when entering from seaward, a buoy that should be left to port will be which color?Not learned 83. Under the IALA-B Buoyage System, which is TRUE of a conical buoy?Not learned 84. In the IALA Buoyage System, what do buoys with alternating red and green horizontal bands indicate?Not learned 85. In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, which is TRUE when fitted with lights?Not learned 86. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?Not learned 87. Under the IALA Buoyage Systems, which is TRUE of the topmark of a red and white vertically-striped buoy?Not learned 88. Under the IALA Buoyage Systems, which is TRUE of safe water marks?Not learned 89. In illustration D045NG below, which shape is a daymark warning of danger?Not learned 90. In illustration D045NG below, what two shapes shown are used to indicate a preferred channel?Not learned 91. What indicates a buoy that should be left to port when entering from seaward? (U.S. Aids to Navigation System)Not learned 92. What will NOT induce errors into a Doppler sonar log?Not learned 93. Which information does the outer ring of a compass rose on a nautical chart provide?Not learned 94. Which instrument is used to predict the approach of a low pressure system?Not learned 95. What is the length of a nautical mile?Not learned 96. 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 97. 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 98. Which light characteristic may be used on a special 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 term is given to a light that has a light period shorter than its dark period?Not learned 101. Which is TRUE concerning Light Lists for coastal waters?Not learned 102. The Light List indicates that a dayboard is a type KGW. You should take which action?Not learned 103. The Light List indicates that a dayboard is a type NB. Which is TRUE?Not learned 104. The Light List indicates that a light has a nominal range of 18 miles and is 38 feet high. If the visibility is 6 miles and your height of eye is 15 feet, at which distance will you sight the light?Not learned 105. The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the port side of a vessel under which condition?Not learned 106. The Light List shows that a navigational light has a nominal range of 18 miles and a height above water of 22 feet (6.7 meters). Your height of eye is 16 feet (4.9 meters) and the visibility is 2.0 miles. At which approximate range will you first sight the light?Not learned 107. The Light List shows that a navigational light has a nominal range of 6 miles and a height above water of 18 feet (5.5 meters). Your height of eye is 47 feet (14.3 meters) and the visibility is 1.5 miles. At what approximate range will you first sight the light?Not learned 108. Which light signal indicates that you may approach the lock?Not learned 109. Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?Not learned 110. Which would you expect to see on a lighted preferred-channel buoy?Not learned 111. What is the name given to lines on a chart which connect points of equal magnetic variation?Not learned 112. A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than which duration?Not learned 113. Which of the listed properties does warm air possess?Not learned 114. At which location is the value of sixty nautical miles per degree of geodetic latitude most correct?Not learned 115. What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?Not learned 116. Which term is given to magnetism which is present only when the material is under the influence of an external field?Not learned 117. How may a spherical buoy be identified?Not learned 118. Which measurement uses mean high water as the reference plane?Not learned 119. Mean lower low water is the reference plane used for which measurements?Not learned 120. On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. What conditions cause this fog?Not learned 121. In modern fathometers, what produces the sonic or ultrasonic sound waves?Not learned 122. A mooring buoy, if lighted, shows which color light?Not learned 123. Which name is given to the pressure-sensitive element of an aneroid barometer?Not learned 124. What is the name of the region of high pressure extending around the Earth at about 35°N latitude?Not learned 125. Which of the Nautical Texts is/are published by the U.S. Coast Guard?Not learned 126. How is a navigation light identified on an Army Corps of Engineers navigation map?Not learned 127. In North America, which direction do the majority of the weather systems move?Not learned 128. 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 129. If you observe a rapid fall of barometric pressure, which action should you take?Not learned 130. When observing a rapid rise in barometric pressure, what may you expect?Not learned 131. How is an occluded front represented on a weather map?Not learned 132. When operated over a muddy bottom, a fathometer may indicate which of the following?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. When outbound from a U.S. port, what does a buoy displaying a flashing red light indicate?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. 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 139. How do preferred channel buoys indicate the preferred channel to transit?Not learned 140. Prior to reading an aneroid barometer, why should you tap the face lightly with your finger?Not learned 141. What publication has information on the climate, distances, navigation regulations, outstanding landmarks, channels and anchorages of Long Island Sound?Not learned 142. Which publication would describe the explosive anchorages in the ports on the east coast of the United States?Not learned 143. What is published by the U.S. Coast Guard?Not learned 144. What is the purpose of the "reference hand" on an aneroid barometer?Not learned 145. Which is TRUE of Radiation fog?Not learned 146. Which is the reference datum used in determining the heights of land features on most charts?Not learned 147. What results when warm moist air blows over a colder surface and is cooled below its dew point?Not learned 148. When is a revised print of a chart made?Not learned 149. The revision date of a chart is printed on which area of the chart?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 statement is TRUE?Not learned 153. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 154. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.Not learned 155. You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?Not learned 156. What is the standard atmospheric pressure as measured in inches of mercury?Not learned 157. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 158. 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 159. The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic describes the light?Not learned 160. Which of the symbols shown in illustration D018NG below represents a warm front?Not learned 161. What does the symbol shown in illustration D033NG below indicate on a chart?Not learned 162. Temperature and moisture characteristics are modified in a warm or cold air mass due to which factor?Not learned 163. Which term defines a submerged dike extending from the bank of the river used to train the channel?Not learned 164. 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 165. Which term is used to describe a generally circular low-pressure area?Not learned 166. Which term is used to describe the wind speed and direction observed from a moving vessel?Not learned 167. Which topmark shown in illustration D023NG below identifies an isolated danger?Not learned 168. A towboat is pushing barges ahead at a dangerously fast speed when __________.Not learned 169. Which is TRUE of a bluff bar?Not learned 170. Which is TRUE concerning daymarks marking the starboard side of the channel when going towards the sea?Not learned 171. What is TRUE concerning new editions of Light Lists?Not learned 172. Which is TRUE concerning the points on the earth's surface where the magnetic dip is 90°?Not learned 173. Which is TRUE of a nun buoy in the IALA Region B system of buoyage?Not learned 174. Which is TRUE of a preferred-channel buoy?Not learned 175. Which type of cloud is the classic "thunderhead"?Not learned 176. Which type of cloud is composed entirely of ice crystals and is found at very high altitudes?Not learned 177. Which type of daymark is used to mark the starboard side of the channel when entering from sea?Not learned 178. Which type of precipitation occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level?Not learned 179. Which type of precipitation is a product of the violent convection in thunderstorms?Not learned 180. Under the U.S. Aids to Navigation System, which category is a yellow buoy?Not learned 181. In the U.S. Aids to Navigation System, lateral aids as seen entering from seaward will display lights with which characteristic?Not learned 182. In the U.S. Aids to Navigation System, what do red and green horizontally-banded buoys mark?Not learned 183. Under the U.S. Aids to Navigation System, a special mark possesses which of the following characteristics?Not learned 184. 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 185. 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 186. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the left descending bank?Not learned 187. 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 188. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy?Not learned 189. 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 190. In United States waters, a buoy having red and white vertical stripes if lighted, it will have which light characteristic?Not learned 191. 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 192. 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 193. When using an echo sounder in deep water, it is NOT unusual to encounter which situation?Not learned 194. The vertical component of the Earth's magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation?Not learned 195. 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 196. 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 197. A vessel sighting a northern right whale dead ahead should take which action?Not learned 198. What volume of the Coast Guard Light List is used for the Mississippi River system?Not learned 199. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 200. Which weather element cannot be measured accurately while on board a moving vessel?Not learned 201. What does a white buoy with an orange circle marked on it indicate?Not learned 202. What does a white buoy with an orange cross within a diamond marked on it indicate?Not learned 203. White lights may be found on which buoys?Not learned 204. If within 500 yards (460m) of a Northern Right Whale, you are lawfully obligated to take which actions?Not learned 205. On a working copy of a weather map, a cold front is represented by what color line?Not learned 206. On a working copy of a weather map what color is the line that represents a warm front?Not learned 207. Where would you expect to find climatological and meteorological tables for the Gulf Coast area?Not learned 208. Yellow lights may appear on which buoys?Not learned 209. On a working copy of a weather map what color is the line that represents a stationary front?Not learned 210. 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 211. What will a buoy marking a wreck show?Not learned 212. How is an occluded front represented on a weather map?Not learned