Q425 - Navigation General: Western Rivers, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. A magnetic compass card is marked in how many degrees?Not learned 2. As a vessel changes course to starboard, which is TRUE concerning the compass card in a magnetic compass?Not learned 3. What does the lubber's line on a magnetic compass indicate?Not learned 4. Which would influence a magnetic compass?Not learned 5. When is a lookout permitted to leave his station?Not learned 6. When must a proper look-out be kept?Not learned 7. What does the abbreviation L.W.R.P. on the navigation maps mean?Not learned 8. According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, where is the center of low pressure located?Not learned 9. Which action should be taken prior to assuming the Deck Watch while the vessel is in port?Not learned 10. What is an advantage of the magnetic compass aboard vessels?Not learned 11. Advection fog is most commonly caused by __________.Not learned 12. Which agency maintains federal aids to navigation?Not learned 13. All aids to navigation listed in the Mississippi River System Light List are shown as miles from a reference point and on the __________.Not learned 14. You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5-mile, 1 mile, and 1.5 miles. Which term is given to these unwanted echoes?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. On which of the following does an automatic identification system (AIS) transponder transmit and receive information?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. 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 20. When changing from a compass course to a true course, which should you apply?Not learned 21. Under which circumstances is the dumping of refuse in a lock permitted?Not learned 22. On a clear, warm day, you notice the approach of a tall cumulus cloud. The cloud top has hard well-defined edges and rain is falling from the dark lower edge. What should you expect if this cloud passes directly overhead?Not learned 23. What do clearance gauges at bridges indicate?Not learned 24. 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 25. Which is most commonly associated with fog?Not learned 26. Which condition(s) is(are) necessary for the formation of dew?Not learned 27. Which condition would most likely result in fog?Not learned 28. Who should be consulted for changing conditions of controlling depths in major channels?Not learned 29. Which defines the controlling depth of the river?Not learned 30. A current moving across a lock entrance toward the river or toward the dam is known by which term?Not learned 31. Which describes a deadhead?Not learned 32. Which is TRUE concerning privately maintained aids to navigation included in the Light List?Not learned 33. Deviation in a compass is caused by which of the following?Not learned 34. What does a Doppler log in the bottom return mode indicate?Not learned 35. When does a Doppler speed log indicate speed over ground?Not learned 36. What are drawbridges equipped with radiotelephones required to display?Not learned 37. What enables you to estimate the bearing of a storm's center?Not learned 38. To find a magnetic compass course from a true course what must you apply?Not learned 39. To find the specific phase characteristic of a lighthouse on a sound of the United States you would use which reference?Not learned 40. Fog is formed when which condition exists?Not learned 41. Fog generally clears when the __________.Not learned 42. The following boats are approaching a lock. Which has priority for locking?Not learned 43. Which of the following describes the difference between true heading and magnetic heading?Not learned 44. Which of the following statements is TRUE regarding automatic identification systems (AIS)?Not learned 45. Which of the following statements is TRUE regarding automatic identification systems (AIS)?Not learned 46. 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 47. Which form of cloud, that is often known as "mackerel sky", is generally associated with fair weather?Not learned 48. As a high-pressure system approaches, which is TRUE concerning the barometer reading?Not learned 49. Which system provides the highest level of commercial navigational accuracy?Not learned 50. Illustration D011NG below represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE?Not learned 51. Which information must automatic identification systems (AIS) automatically provide to appropriately equipped shore stations, vessels and aircraft?Not learned 52. Which level of accuracy can be obtained utilizing the U.S. Coast Guard's Maritime Differential GPS in an established coverage area?Not learned 53. 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 54. 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 55. 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 56. 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 57. Which of the listed properties does warm air possess?Not learned 58. The lock chamber is 600 feet X 110 feet. Your towboat is 150 feet X 35 feet. Which of these tows will require a double lockage?Not learned 59. 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 60. 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 61. On the Mississippi and Ohio Rivers, there is a special type of fog known as steam fog. What conditions cause this fog?Not learned 62. What must change for the compass deviation to change?Not learned 63. Who publishes the navigation charts of the Upper Mississippi River?Not learned 64. How is a navigation light identified on an Army Corps of Engineers navigation map?Not learned 65. The navigation regulations applicable to a U.S. inland waterway can be found in which publication?Not learned 66. In North America, which direction do the majority of the weather systems move?Not learned 67. If you observe a rapid fall of barometric pressure, which action should you take?Not learned 68. If an observer in the Northern Hemisphere faces the surface wind, where is the center of low pressure located?Not learned 69. You have been observing your radar screen and notice that a contact on the screen has remained in the same position, relative to you, for several minutes. Your vessel is making 10 knots through the water. Which statement is TRUE?Not learned 70. When observing a rapid rise in barometric pressure, what may you expect?Not learned 71. In order to utilize the capacity of a lock to its maximum, pleasure craft are locked through with all of the following EXCEPT which barges?Not learned 72. Which organization operates the Maritime Differential GPS (DGPS)?Not learned 73. All persons or vessels within the lock area, including the lock approach channels, come under the authority of which person?Not learned 74. 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 75. While proceeding downriver (descending) you sight a red diamond-shaped panel with small, red reflector squares in each corner on the left bank. Under the U.S. Aids to Navigation System on the Western Rivers what does this daymark indicate?Not learned 76. 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 77. Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?Not learned 78. What is published by the U.S. Coast Guard?Not learned 79. Which radar control shortens all echoes on the display and reduces clutter caused by rain or snow?Not learned 80. Which term is given to a radar display which is oriented, so that north is always at the top of the screen?Not learned 81. Your radar displays your ship off center. As you proceed on your course, your ship's marker moves on the PPI scope while echoes from land masses remain stationary. What is this display called?Not learned 82. Radar makes the most accurate determination of the __________.Not learned 83. With regard to GPS, a civilian receiver may be capable of achieving the same accuracy as a military receiver if __________.Not learned 84. With respect to failure warnings and status indications, GPS receivers should provide, at a minimum, __________.Not learned 85. A section of the river that is narrower than usual and is often navigable from bank to bank is a __________.Not learned 86. What does a slow rise in the barometric pressure forecast?Not learned 87. In which source could you find the vertical clearance of a bridge on the Ohio River?Not learned 88. What is the standard atmospheric pressure in millibars?Not learned 89. Steam fog is most likely to occur on the Mississippi and Ohio Rivers in __________.Not learned 90. 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 91. Which term defines a submerged dike extending from the bank of the river used to train the channel?Not learned 92. 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 93. Which is TRUE of a bluff bar?Not learned 94. Which is TRUE concerning Hot air?Not learned 95. What is TRUE concerning new editions of Light Lists?Not learned 96. Which is TRUE of the direction of flow (channel) on the Corps of Engineer's Navigation Maps?Not learned 97. Which is TRUE when using the radar for navigation?Not learned 98. Which type of precipitation occurs only in thunderstorms with strong convection currents that convey raindrops above and below the freezing level?Not learned 99. Which type of weather could you expect soon after seeing "hook" or "comma" shaped cirrus clouds?Not learned 100. 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 101. 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 102. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the left descending bank?Not learned 103. 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 104. Under the U.S. Aids to Navigation System on the Western Rivers, which describes the daymarks on the right descending bank?Not learned 105. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy?Not learned 106. 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 107. 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 108. Under the Uniform State Waterway Marking System how is a mooring buoy painted?Not learned 109. 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 110. You are using a radar in which your own ship is shown at the center, and the heading flash always points to 0°. If bearings are measured in relation to the flash, what type of bearings are produced?Not learned 111. Your vessel is moored portside to and you are taking over the Deck Watch. Which item has the most impact on the safety of the vessel and crew?Not learned 112. 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 113. 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 114. What volume of the Coast Guard Light List is used for the Mississippi River system?Not learned 115. 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 116. According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northeast wind, where is the center of low pressure located?Not learned 117. With regard to GPS, how can a civilian receiver may be capable of achieving the same accuracy as a military receiver?Not learned