Q382 - 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. When adjusting a magnetic compass for error, which is TRUE concerning the deviation table?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. When is an air mass termed "warm"?Not learned 9. Which is TRUE of an alternating light?Not learned 10. Aneroid barometers are usually calibrated to indicate atmospheric pressure in which units?Not learned 11. Which is a characteristic of anticyclones?Not learned 12. You are approaching a drawbridge and must pass through during a scheduled closure period. What signal should you sound?Not learned 13. 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 14. You are approaching a multiple-span bridge at night. How is the main navigational channel span indicated?Not learned 15. You are approaching a vertical lift bridge. How do you know when the span is fully open?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. A backlash below a lock is defined as __________.Not learned 19. A bluff bar is a bar __________.Not learned 20. Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.Not learned 21. Where are buoys and day beacons exhibiting a yellow triangle or square painted on them used?Not learned 22. Buoys which mark dredging areas are painted which color?Not learned 23. How are buoys which mark isolated dangers painted?Not learned 24. A buoy marking a wreck will show a(n) __________.Not learned 25. Which buoy may be odd numbered?Not learned 26. What causes compass deviation?Not learned 27. What causes deviation in a magnetic compass?Not learned 28. 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 29. You are in a channel in U.S. waters near an industrial plant with a load/discharge facility for barges. You see an emergency rotating flashing light on the facility light up. What does this indicate?Not learned 30. Which is a characteristic of a port side daymark?Not learned 31. You are in charge of a power-driven vessel crossing a river on the Western Rivers. You must keep out of the way of __________.Not learned 32. 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 33. Under which circumstances is the dumping of refuse in a lock permitted?Not learned 34. Which cloud commonly produces a halo about the Sun or Moon?Not learned 35. How are clouds formed?Not learned 36. What color lights do lighted information markers display?Not learned 37. Which is the most commonly encountered fog at sea?Not learned 38. When compared to air temperature, which factor is most useful in predicting fog?Not learned 39. Which condition(s) is(are) necessary for the formation of dew?Not learned 40. Which condition would most likely result in fog?Not learned 41. Which defines the controlling depth of the river?Not learned 42. By convention, what color is the south pole of a magnet painted?Not learned 43. By convention, the Earth's south magnetic pole is which color?Not learned 44. Which corrector will compensate for the deviation which is maximum on intercardinal compass headings?Not learned 45. Which of the following should be done when crossing the magnetic equator?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 shape is used in the lateral system?Not learned 49. A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below?Not learned 50. 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 51. A daymark used as a special mark is indicated by which letter in illustration D045NG below?Not learned 52. Which describes a deadhead?Not learned 53. Which defines a bold reef?Not learned 54. Which defines the term relative humidity?Not learned 55. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 56. The dew point is reached when which condition occurs?Not learned 57. What does a Doppler log in the bottom return mode indicate?Not learned 58. A Doppler log in the volume reverberation mode indicates __________.Not learned 59. When does a Doppler speed log indicate speed over ground?Not learned 60. How is the draw span of a floating drawbridge marked?Not learned 61. 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 62. 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 63. The dry bulb temperature is 78°F and the wet bulb temperature is 62°F. What is the relative humidity?Not learned 64. 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 65. An electronic depth finder operates on which principle?Not learned 66. You are enroute to Sioux City, Iowa on the Missouri River. When would you most likely encounter a frontal thunderstorm?Not learned 67. 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 68. 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 69. What can be expected with the presence of stratus clouds and a dying wind?Not learned 70. A facility used for the discharge of a cargo of a particular hazard, such as chlorine, butane or ethane, must have what to warn water traffic of an immediate danger during fire or cargo release?Not learned 71. Fog forms when which condition exists?Not learned 72. Fog forms when the air temperature is at or below __________.Not learned 73. Fog generally clears when the __________.Not learned 74. Which of the following is the most accurate method of determining gyrocompass error while underway?Not learned 75. Which of the following is associated with consistently high barometric pressure?Not learned 76. The following boats are approaching a lock. Which has priority for locking?Not learned 77. Which of the following describes the difference between true heading and magnetic heading?Not learned 78. Which form of cloud, that is often known as "mackerel sky", is generally associated with fair weather?Not learned 79. Red lights may appear on which buoys?Not learned 80. What happens to the barometric pressure after a cold front passes?Not learned 81. The height of a light is measured from which reference plane?Not learned 82. 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 83. Under the IALA-A and B Buoyage Systems, what does a buoy with alternating red and white vertical stripes indicate?Not learned 84. Under the IALA-B Buoyage System, which is TRUE of a conical buoy?Not learned 85. In the IALA Buoyage System, what do buoys with alternating red and green horizontal bands indicate?Not learned 86. In the IALA Buoyage System, preferred-channel-to-port or preferred-channel-to-starboard buoys, which is TRUE when fitted with lights?Not learned 87. Under the U.S. Aids to Navigation System, what does a lighted buoy with a spherical topmark mark indicate?Not learned 88. Under the IALA Buoyage Systems, which is TRUE of the topmark of a red and white vertically-striped buoy?Not learned 89. Under the IALA Buoyage Systems, which is TRUE of safe water marks?Not learned 90. In illustration D045NG below, which shape is a daymark warning of danger?Not learned 91. By what means are indications of the master gyrocompass sent to remote repeaters?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 may a towing vessel, engaged in towing exclusively on the Western Rivers, use in place of a magnetic compass?Not learned 95. Which instrument is used to predict the approach of a low pressure system?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. The Light List indicates that a dayboard is a type KGW. You should take which action?Not learned 102. The Light List indicates that a dayboard is a type NB. Which is TRUE?Not learned 103. 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 104. 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 105. 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 106. Which light signal indicates that you may approach the lock?Not learned 107. 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 108. What is the name given to lines on a chart which connect points of equal magnetic variation?Not learned 109. Which line connects the points of zero magnetic dip?Not learned 110. 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 111. Magnets in the binnacles of magnetic compasses are used to reduce which effect?Not learned 112. 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 113. Which measurement uses mean high water as the reference plane?Not learned 114. Mean lower low water is the reference plane used for which measurements?Not learned 115. On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. What conditions cause this fog?Not learned 116. In modern fathometers, what produces the sonic or ultrasonic sound waves?Not learned 117. Which name is given to the pressure-sensitive element of an aneroid barometer?Not learned 118. What is the name of the region of high pressure extending around the Earth at about 35°N latitude?Not learned 119. Which of the Nautical Texts is/are published by the U.S. Coast Guard?Not learned 120. Who publishes the navigation charts of the Upper Mississippi River?Not learned 121. How is a navigation light identified on an Army Corps of Engineers navigation map?Not learned 122. In North America, which direction do the majority of the weather systems move?Not learned 123. When observing a rapid rise in barometric pressure, what may you expect?Not learned 124. How is an occluded front represented on a weather map?Not learned 125. When operated over a muddy bottom, a fathometer may indicate which of the following?Not learned 126. 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 127. All persons or vessels within the lock area, including the lock approach channels, come under the authority of which person?Not learned 128. 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 129. How do preferred channel buoys indicate the preferred channel to transit?Not learned 130. Prior to reading an aneroid barometer, why should you tap the face lightly with your finger?Not learned 131. Which publication should you check for complete information on Puget Sound weather conditions?Not learned 132. Which publication(s) must a towing vessel of 12 meters or more in length carry when operating on US waters other than the Western Rivers?Not learned 133. Which publication would describe the explosive anchorages in the ports on the east coast of the United States?Not learned 134. What is published by the U.S. Coast Guard?Not learned 135. Quadrantal error in a gyrocompass has its GREATEST effect on which of the following?Not learned 136. Which is TRUE of Radiation fog?Not learned 137. Which is the reference datum used in determining the heights of land features on most charts?Not learned 138. In regions near the poles, how are the winds generally described?Not learned 139. What results when warm moist air blows over a colder surface and is cooled below its dew point?Not learned 140. When is a revised print of a chart made?Not learned 141. The revision date of a chart is printed on which area of the chart?Not learned 142. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 143. Your ship is returning to New Orleans from a foreign voyage and carrying a bulk cargo of anhydrous ammonia. Under what conditions must you must notify the Captain of the Port, New Orleans?Not learned 144. The shoreline shown on nautical charts of areas affected by large tidal fluctuations is usually the line of mean __________.Not learned 145. 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 146. A special mark (yellow buoy), if lighted, may exhibit which light rhythm?Not learned 147. The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?Not learned 148. What is the standard atmospheric pressure as measured in inches of mercury?Not learned 149. Which statement concerning the chartlet seen in illustration D010NG below is TRUE? (Soundings and heights are in meters)Not learned 150. Which statement about gyrocompass error is TRUE?Not learned 151. Which statement is TRUE for an unlighted, red and green, horizontally-banded buoy with the topmost band red?Not learned 152. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 153. Steam fog will occur when which conditions exists?Not learned 154. 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 155. 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 156. Which symbol represents a 2-fathom curve?Not learned 157. What does the symbol shown in illustration D033NG below indicate on a chart?Not learned 158. What is a system of reservoirs and connecting tubes in a gyro compass called?Not learned 159. Which table is NOT found in the U.S. Coast Pilots?Not learned 160. Which is TRUE as the temperature of an air mass decreases?Not learned 161. Temperature and moisture characteristics are modified in a warm or cold air mass due to which factor?Not learned 162. Which term defines a submerged dike extending from the bank of the river used to train the channel?Not learned 163. 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 164. Which term is used to describe a generally circular low-pressure area?Not learned 165. Which term is used to describe the wind speed and direction observed from a moving vessel?Not learned 166. Which topmark shown in illustration D023NG below identifies an isolated danger?Not learned 167. A towboat is pushing barges ahead at a dangerously fast speed when __________.Not learned 168. Which is TRUE of a bluff bar?Not learned 169. Which is TRUE if the compass error of a magnetic compass has no deviation?Not learned 170. Which is TRUE concerning daymarks marking the starboard side of the channel when going towards the sea?Not learned 171. Which is TRUE concerning the flow of air around an anticyclone in the Southern Hemisphere?Not learned 172. Which is TRUE of the direction of flow (channel) on the Corps of Engineer's Navigation Maps?Not learned 173. Which is TRUE of a downbound power-driven vessel, when meeting an upbound vessel on the Western Rivers?Not learned 174. Which is TRUE on the Western Rivers when a vessel downbound with a following current is meeting an upbound vessel?Not learned 175. Which type of cloud is composed entirely of ice crystals and is found at very high altitudes?Not learned 176. Which type of cloud is hail most likely to fall from?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. 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 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. When using an echo sounder in deep water, it is NOT unusual to encounter which situation?Not learned 193. Your vessel is on course 180°T speed 22 knots. The apparent wind is from 70° off the port bow, speed 20 knots. What are the true direction and speed of the wind?Not learned 194. 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 195. A vessel crossing a river on the Western Rivers, must keep out of the way of which power-driven vessel?Not learned 196. INLAND ONLY A power-driven vessel crossing on the Western Rivers has the right of way over which vessels?Not learned 197. INLAND ONLY A power-driven vessel proceeding downstream in a narrow channel on the Western Rivers sights another power-driven vessel moving upstream. Which vessel has the right of way?Not learned 198. 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 199. Vessels regularly navigating Ohio and Mississippi rivers above Cairo, Illinois, and their tributaries, shall at all times have on board a copy of __________.Not learned 200. A vessel sighting a northern right whale dead ahead should take which action?Not learned 201. What volume of the Coast Guard Light List is used for the Mississippi River system?Not learned 202. What weather change accompanies the passage of a cold front in the Northern Hemisphere?Not learned 203. What does a white buoy with an orange circle marked on it indicate?Not learned 204. What does a white buoy with an orange cross within a diamond marked on it indicate?Not learned 205. What does a white buoy with an orange rectangle on it indicate?Not learned 206. White lights may be found on which buoys?Not learned 207. If within 500 yards (460m) of a Northern Right Whale, you are lawfully obligated to take which actions?Not learned 208. On a working copy of a weather map, a cold front is represented by what color line?Not learned 209. On a working copy of a weather map what color is the line that represents a warm front?Not learned 210. Where would you expect to find climatological and meteorological tables for the Gulf Coast area?Not learned 211. Yellow lights may appear on which buoys?Not learned 212. Which symbol represents a 20-fathom curve?Not learned 213. On a working copy of a weather map what color is the line that represents a stationary front?Not learned 214. 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 215. You are downbound approaching a lock and see 3 green lights in a vertical line. What does this indicate?Not learned 216. What will a buoy marking a wreck show?Not learned 217. How is an occluded front represented on a weather map?Not learned