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Deck · 2,138 questions

General Navigation - USCG Exam Questions

Chart reading, the U.S. Aids to Navigation System, compass error, tides and currents, and the standard navigation publications.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All General Navigation questions

Questions 801–900 of 2,138 · page 9 of 22

  1. #852 In general, on how many radio channels will an automatic identification system (AIS) operate?
  2. #853 Wind direction may be determined by observing all of the following EXCEPT __________.
  3. #855 Chart information details to be used in ECDIS should be the latest edition of information originated by a government-authorized hydrographic office an...
  4. #857 Ascending and descending air masses with different temperatures is part of an important heat transmitting process in our atmosphere called __________.
  5. #859 Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1°E. Which true bearing should...
  6. #860 The direction of the southeast trade winds is a result of the __________.
  7. #862 The highest frequency of tropical cyclones in the North Atlantic Ocean occurs during __________.
  8. #863 A tropical storm is a tropical cyclone that generates winds of __________.
  9. #864 If your mercurial barometer reads 30.50 inches (1033 millibars) and the temperature is 56°F (13°C), what is the correct reading at 55°N, 150°W?
  10. #865 Above-normal tides near the center of a hurricane may be caused by the __________.
  11. #866 A tsunami is caused by a(n) __________.
  12. #869 What enables you to estimate the bearing of a storm's center?
  13. #870 Which information must automatic identification systems (AIS) automatically provide to appropriately equipped shore stations, vessels and aircraft?
  14. #871 You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere. What action should you take to avoid the st...
  15. #872 Which statement describes the prevailing wind direction in mid-winter in the Gulf Coast area?
  16. #873 Electronic Plotting Aid (EPA) has which built in functions?
  17. #875 Apparent wind speed blowing across your vessel while underway can be measured by a(n) __________.
  18. #876 How many targets can an Electronic Plotting Aid (EPA) track at the same time?
  19. #877 That half of the hurricane to the right hand side of its track (as you face the same direction that the storm is moving) in the Northern Hemisphere is...
  20. #878 In the Northern hemisphere which semicircle of a hurricane is the navigable semicircle?
  21. #879 When using an echo sounder in deep water, it is NOT unusual to __________.
  22. #880 An air mass that has moved down from Canada would most likely have the symbols __________.
  23. #881 The intensity of a hurricane as it reaches higher latitudes and cooler waters __________.
  24. #882 The navigable semicircle of a hurricane in the Northern Hemisphere is that area of the storm measured __________.
  25. #885 When using an Electronic Plotting Aid (EPA), what should you consider in order to evaluate the information displayed?
  26. #887 In the Northern Hemisphere, what type of cloud formations would you expect to see to the west of an approaching tropical wave?
  27. #889 Atmospheric pressure may be measured with a(n) __________.
  28. #890 A Doppler log in the volume reverberation mode indicates __________.
  29. #891 Static on your AM radio may be __________.
  30. #893 What is the average speed of movement of a hurricane prior to recurvature?
  31. #894 The velocity of the apparent wind can be more than the true wind, and come from the same direction, if certain conditions are present. One condition i...
  32. #895 Weather systems in the middle latitudes generally travel from __________.
  33. #896 Using the surface analysis in illustration D049NG below, what change in the wind direction could be expected at position "D" if the low were moving no... illustration
  34. #897 Tropical cyclones do not form within 5° of the Equator because __________.
  35. #899 Which of the following statements is TRUE regarding automatic identification systems (AIS)?
  36. #900 The strongest winds and heaviest rains in a hurricane are found in the __________.
  37. #902 Which of the following statements is TRUE regarding automatic identification systems (AIS)?
  38. #903 Plain language is usually used on marine weather __________.
  39. #904 What indicates the arrival of a hurricane within 24 to 36 hours?
  40. #905 Which of the following statements is TRUE regarding automatic identification systems (AIS)?
  41. #906 The Earth's irregular heating is caused by __________.
  42. #907 What will cause the ARPA to emit a visual alarm, audible alarm, or both?
  43. #908 Your ARPA has been tracking a target and has generated the targets course and speed. The radar did not receive a target echo on its last two scans due...
  44. #909 Vessels required to have an Automatic Radar Plotting Aid must have a device to indicate the __________.
  45. #910 In the Northern Hemisphere a wind is said to veer when the wind __________.
  46. #911 The first cloud formations you can use to indicate the bearing of the center of a hurricane or tropical storm are __________.
  47. #913 Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel?
  48. #914 While taking weather observations, you determine that the wind is coming from the west. In the weather log, you would record the wind direction as ___...
  49. #916 Which weather element cannot be measured accurately while on board a moving vessel?
  50. #917 The ARPA may swap targets when automatically tracking if two targets __________.
  51. #918 Ocean swells originating from a typhoon can move ahead of it at speeds near __________.
  52. #919 What should you expect when you encounter a tsunami in the open ocean?
  53. #920 You are enroute from Puerto Rico to New York. A hurricane makes up and is approaching. If the wind veers steadily, this indicates that your vessel is...
  54. #921 A mercurial barometer at sea is subject to rapid variations in height ("pumping") due to the pitch and roll of the vessel. To avoid this error, measur...
  55. #922 A steep barometric gradient indicates __________.
  56. #923 Your ARPA has two guard zones. What is the purpose of the inner guard zone?
  57. #924 When using the ARPA in heavy rain, which action should you take?
  58. #925 If the electronic chart is part of an ECDIS, it must display the minimum data required by IMO/IHO, to include all of the following EXCEPT __________.
  59. #926 Which of the following must the electronic chart of an ECDIS display, as required by IMO/IHO?
  60. #927 ECDIS units incorporate Digital Chart Data Formats, which include __________.
  61. #928 Raster-scan chart data is __________.
  62. #929 Which of the following are data layer categories to be displayed on ECDIS?
  63. #930 All echo-sounders can measure the __________.
  64. #931 Which of the following data layer categories is NOT displayed on ECDIS?
  65. #932 Coral atolls, or a chain of islands at right angles to the radar beam, may show as a long line rather than as individual targets due to __________.
  66. #933 Which meteorological feature controls the climate of the Gulf and the Gulf Coast area during late spring and summer?
  67. #934 The eye of a hurricane is surrounded by dense black cumulonimbus clouds which are called the __________.
  68. #935 In the Northern Hemisphere, if your vessel is in a hurricane's navigable semicircle it should be positioned with the wind on the __________.
  69. #937 Your Electronic Plotting Aid (EPA) has two guard zones. What is the purpose of the inner guard zone?
  70. #938 An ECDIS is required to display which information?
  71. #940 The database resulting from (1) the transformation of the electronic navigational chart (ENC) by ECDIS for appropriate use, (2) the updates to the ENC...
  72. #941 The database information that should be shown when a chart is first displayed on ECDIS is the __________.
  73. #942 The level of database information which cannot be removed from the ECDIS display and consists of information which is required at all times in all geo...
  74. #947 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 remai...
  75. #949 The time interval between successive wave crests is called the __________.
  76. #950 ECDIS must have the capability to preserve the record of the voyage track for the previous __________.
  77. #952 Aneroid barometers are usually calibrated to indicate atmospheric pressure in __________.
  78. #953 Which of the following must an ECDIS system be able to perform?
  79. #954 ECDIS must be able to perform all of the following EXCEPT __________.
  80. #955 What will cause the Electronic Plotting Aid (EPA) to emit a visual alarm, audible alarm, or both?
  81. #956 What option does an Electronic Plotting Aid (EPA) not have?
  82. #957 The passing of a low pressure system can be determined by periodically checking the __________.
  83. #958 Vessel required to have an Electronic Plotting Aid (EPA) must have a device to indicate the __________.
  84. #959 Air masses near the earth's surface __________.
  85. #960 Barometer readings in weather reports are given in terms of pressure at __________.
  86. #961 Your Electronic Plotting Aid (EPA) has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over...
  87. #962 You are in the Northern Hemisphere and a tropical wave is located 200 miles due east of your position. Where will the wave be located 12 hours later?
  88. #963 In a microbarograph, the pen should be checked and the inkwell filled __________.
  89. #964 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 4 seconds after the signal was sounded. What is the...
  90. #966 When using the Electronic Plotting Aid (EPA) in heavy rain, which action should you take?
  91. #967 Electronic Plotting Aid (EPA) has which built in functions?
  92. #968 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The sky is... illustration
  93. #969 A hurricane moving northeast out of the Gulf passes west of your position. You could expect all of the following EXCEPT __________.
  94. #970 What kind of pressure systems travel in tropical waves?
  95. #971 The speed of sound through ocean water is nearly always __________.
  96. #972 When operated over a muddy bottom, a fathometer may indicate __________.
  97. #973 Which factor has the greatest effect on the amount of gain required to obtain a fathometer reading?
  98. #974 Early indications of the approach of a hurricane may be all of the following EXCEPT __________.
  99. #975 The speed of sound in water is approximately __________.
  100. #976 Low pressure disturbances, which travel along the intertropical convergence zone, are called __________.

General Navigation questions: what to expect

Q How many General Navigation questions are in the Deck pool?

There are 2,138 General Navigation questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its General Navigation module from the same pool.

Q What score do I need to pass the General Navigation module?

Most USCG exam modules, including General Navigation, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG General Navigation exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

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About the Deck question pool

The Deck pool holds the current U.S. Coast Guard questions for every deck credential, from Able Seaman and the OUPV six-pack up to unlimited Master. Each question is multiple choice with four options, graded instantly, with the USCG reference shown where one exists.