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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 701–800 of 2,138 · page 8 of 22

  1. #742 In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to br...
  2. #743 Yesterday you took a time tick using the 1200 GMT broadcast, and the chronometer read 11h 59m 59s. Today at the 1200 GMT time tick the chronometer rea...
  3. #744 Which of the following is NOT a form of precipitation?
  4. #745 In illustration D039NG below, what type of cloud is indicated by the number one? illustration
  5. #746 What causes the error of collimation with regards to the four adjustments to a sextant?
  6. #748 When using a mechanical (windup type) marine chronometer, how often should it be reset?
  7. #750 Yesterday your chronometer read 03h 01m 56s at the 1500 GMT time tick. Today your chronometer read 03h 01m 54s at the 1500 GMT time tick. What is the...
  8. #752 When using the radar for navigating __________.
  9. #753 The climate of the northern Gulf coast __________.
  10. #754 You can expect frontal activity when two air masses collide and __________.
  11. #755 Prevailing winds between 30°N and 60°N latitude are from the __________.
  12. #756 Yesterday your chronometer read 11h 59m 58s at the 1200 GMT time tick. Today your chronometer reads 12h 00m 00s at the 1200 time tick. What is the chr...
  13. #757 You are approaching a sea buoy which emits a racon signal. This signal is most frequently triggered by which type of radar?
  14. #758 Which condition suggests that your present position lies in the navigable semicircle of a tropical storm?
  15. #759 Yesterday your chronometer read 03h 01m 56s at the 1500 GMT time tick. Today your chronometer read 03h 01m 58s at the 1500 GMT time tick. What is the...
  16. #760 Yesterday your chronometer read 02h 59m 58s at the 1500 GMT time tick. Today the chronometer reads 03h 00m 02s at the 1500 GMT time tick. What is the...
  17. #762 What is a nonadjustable error of the sextant?
  18. #763 When drawing a weather map and an isobar crosses a front, the isobar is drawn __________.
  19. #764 Which condition indicates that you are in a hurricane's dangerous semicircle in the Northern hemisphere?
  20. #765 On the pole side of the high pressure belt in each hemisphere, the pressure diminishes. The winds along these gradients are diverted by the Earth's ro...
  21. #766 Index error of a sextant is primarily caused by __________.
  22. #767 A sextant having an index error that is "on the arc" has a __________.
  23. #768 Air circulation is caused or affected by __________.
  24. #769 Weather forecast messages are usually __________.
  25. #770 Yesterday your chronometer read 11h 59m 59s at 1200 GMT time tick. Today the chronometer reads 12h 00m 01s at the 1200 GMT tick. What is the chronomet...
  26. #771 On a weather map, a large letter "H" means __________.
  27. #772 The direction of the surface wind is __________.
  28. #773 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 2 seconds after the signal was sounded. What is the d...
  29. #774 If the current and wind are in the same direction, the sea surface represents a wind speed __________.
  30. #775 You are steaming eastward in the North Atlantic in an extratropical cyclonic storm and the wind is dead ahead. According to the law of Buys Ballot, th...
  31. #777 A line of clouds, sharp changes in wind direction, and squalls are most frequently associated with a(n) __________.
  32. #779 Monsoons are characterized by __________.
  33. #780 Chronometer error may be found by __________.
  34. #781 You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurricane is...
  35. #782 What is TRUE concerning an anemometer on a moving vessel?
  36. #783 An Electronic Plotting Aid (EPA) will drop off a target's vector if more than __________ minutes elapse between each manual plot.
  37. #784 The climate of the eastern Gulf coast __________.
  38. #785 What is TRUE of the history display of a target's past positions on an ARPA?
  39. #786 The steepness of a cold front depends on __________.
  40. #787 Your vessel is participating in the Voluntary Observing Ship Program, at 1200 ZT on 31 July, your position is LAT 24°33'N, LONG 173°05'W. You are prep... illustration
  41. #788 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ships fog horn 3 1/2 seconds after the signal was sounded. What is t...
  42. #789 Which of the four adjustable errors in the sextant is the principle cause of index error?
  43. #790 Which of the following statements is TRUE regarding automatic identification systems (AIS)?
  44. #791 Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should y...
  45. #792 A very light breeze that causes ripples on a small area of still water is a __________.
  46. #793 A sea breeze is a wind __________.
  47. #794 Advection fog is most commonly caused by __________.
  48. #795 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Twenty-five... illustration
  49. #796 A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a __________.
  50. #798 Because of the reflecting properties of a sextant, if the sextant altitude reads 60° on the limb, the actual arc of the limb from 0° to the 60° readin...
  51. #799 When using GPS without Selective Availability, you may expect your horizontal accuracy to be better than __________.
  52. #800 "Surface circulation" is another term for __________.
  53. #801 In the Northern Hemisphere, an observer at point II in illustration D014NG below, should experience a wind shift from what direction? illustration
  54. #802 What will NOT induce errors into a Doppler sonar log?
  55. #803 On what does the operation of an aneroid barometer depend?
  56. #804 Most GPS receivers use the Doppler shift of the carrier phase to compute __________.
  57. #805 Severe tropical cyclones (hurricanes, typhoons) occur in all warm-water oceans except the __________.
  58. #806 In what order should the following sextant adjustments be made? I. Make telescope parallel to frame of sextant. II. Set horizon glass perpendicular to...
  59. #807 Which is a nonadjustable error of the sextant?
  60. #808 In many areas "atoll" clouds (clouds of vertical development) are produced over small islands. These are the result of __________.
  61. #809 In order to insure that the racon signal is visible on your 3 cm radar, the __________.
  62. #810 Which change in the condition of the seas could indicate the formation of a tropical storm or hurricane several hundred miles from your location?
  63. #811 The part of a sextant mounted directly over the pivot of the index arm is the __________.
  64. #812 When the index and horizon mirrors of a properly adjusted sextant are at an angle of 45° to each other, the arc reads __________.
  65. #813 Which scale is used to estimate wind speed by observing sea conditions __________.
  66. #814 Three or four feet of the total height of a storm surge in a hurricane can be attributed to __________.
  67. #815 You are approaching Chatham Strait from the south in foggy weather. You have Coronation Island and Hazy Islands on the radar. Suddenly the radar malfu...
  68. #816 If you are caught in the left semicircle of a tropical storm, in the Southern Hemisphere, you should bring the wind __________.
  69. #817 The winds with the greatest effect on the set, drift, and depth of the equatorial currents are the __________.
  70. #818 Which of the four adjustable errors in the sextant causes side error?
  71. #819 In shallow water, waves that are too steep to be stable, causing the crests to move forward faster than the rest of the wave, are called __________.
  72. #820 In the Northern Hemisphere, a wind that shifts counterclockwise is a __________.
  73. #821 Barometers are calibrated at a standard temperature of __________.
  74. #822 Warm air masses will generally have __________.
  75. #823 If a hurricane several hundred miles away is moving in your general direction your barometer would __________.
  76. #825 Your vessel is on course 150°T, speed 17 knots. The apparent wind is from 40° off the starboard bow, speed 15 knots. What is the speed of the true win...
  77. #826 What is the average speed of the movement of a hurricane following the recurvature of its track?
  78. #827 Which of these sextant errors is nonadjustable?
  79. #828 The horizon glass of a sextant is __________.
  80. #829 For a well made and well maintained sextant, the maximum value of which correction is usually so small that it can be ignored?
  81. #830 What level of development of a tropical cyclone has a hundred mile radius of circulation, gale force winds, less than 990 millibars of pressure and ve...
  82. #831 A sextant having an index error that is "off the arc" has a __________.
  83. #832 The hurricane season in the North Atlantic Ocean reaches its peak during the month of __________.
  84. #833 Which type of cloud is among the most dependable for giving an indication of an approaching weather system?
  85. #834 When reporting wind direction, you should give the direction in __________.
  86. #835 You are underway on course 050°T and your maximum speed is 13 knots. The eye of a hurricane bears 100°T, 120 miles from your position. The hurricane i...
  87. #836 The marine sextant is subject to seven different types of errors, four of which may be corrected by the navigator. An error NOT correctable by the nav...
  88. #837 Which cloud type is normally associated with thunderstorms?
  89. #838 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. The direction and speed of the true wi...
  90. #839 You are steaming west in the North Atlantic in an extratropical cyclonic storm, and the wind is dead ahead. According to the law of Buys Ballot, the c...
  91. #840 In order to remove index error from a sextant, you should adjust the __________.
  92. #842 Swell is the rise and fall of the ocean's surface due to __________.
  93. #843 The index error is determined by adjusting the __________.
  94. #844 A source of an air mass labeled mTw is __________.
  95. #845 A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant...
  96. #847 The best estimate of the wind direction at sea level can be obtained from observing the direction of the __________.
  97. #848 In order to remove side error from a sextant, you should adjust the __________.
  98. #849 When your vessel is on or near the path of an approaching tropical storm the __________.
  99. #850 A hygrometer is a device used for determining __________.
  100. #851 While navigating in fog off a coastline of steep cliffs, you hear the echo of the ship's fog horn 4 1/2 seconds after the signal was sounded. What is...

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.