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Deck · 2,639 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 2,401–2,500 of 2,639 · page 25 of 27

  1. #2606 Which is TRUE concerning daymarks marking the starboard side of the channel when going towards the sea?
  2. #2607 The ARPA may swap targets when automatically tracking if two targets are in which situation?
  3. #2608 Local sidereal time is equal to the __________.
  4. #2609 Your weather chart indicates that you will cross the cold front of a low-pressure system in about 24 hours. Which statement is TRUE?
  5. #2610 In a weather report, which defines the term "visibility"?
  6. #2611 When is the planet Mars not visible to us?
  7. #2612 Which of the listed properties does warm air possess?
  8. #2613 Under the IALA-A Buoyage system, a buoy marking the starboard side of the channel when approaching from seaward may have which feature?
  9. #2614 Distance along a track line is measured on a Mercator chart by using which method?
  10. #2615 When do neap tides occur?
  11. #2616 Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to...
  12. #2617 Under the IALA Buoyage System, which topmark shown in the illustration will be displayed on a safe watermark? wration D023NG
  13. #2618 What is the term used for the horizontal angle between the magnetic meridian and the north-south line axis line of the magnetic compass?
  14. #2619 Under the Uniform State Waterway Marking System how is a mooring buoy painted?
  15. #2620 In reading a weather map, what do closely spaced pressure gradient lines indicate?
  16. #2621 The illustration represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? illustration
  17. #2622 What does the symbol shown in the illustration indicate on a chart? illustration
  18. #2623 Which describes the distance between the surface of the water and the tidal datum?
  19. #2624 Fog forms when which condition exists?
  20. #2625 What is the standard atmospheric pressure as measured in inches of mercury?
  21. #2626 If your vessel were proceeding up river (ascending), how is the port side of the channel marked according to the U. S. Aids to Navigation System on th...
  22. #2627 4.8.4-13) Your vessel is entering port, and you have steadied up on a range, dead ahead, in line with your keel. After a few minutes the range, still... illustration
  23. #2628 You will be transiting a traffic lane with a wreck having a charted depth of 40 feet. The Zone of Confidence (ZOC) for that area of the chart is ZOC U... illustration
  24. #2629 You can expect frontal activity when two air masses when which condition(s) is/are present?
  25. #2630 Your vessel is on course 093°T at 15 knots. At 1835 a light bears 136°T, and at 1857 the same light bears 170°T. What was your distance off the light...
  26. #2631 Which time meridian is used for tide computations in New York Harbor?
  27. #2632 What does a white buoy with an open-faced orange diamond on it indicate?
  28. #2633 A line of position from a celestial observation is a segment of which choice?
  29. #2634 While proceeding along the Norwegian coast on course 039°T, you sight the black-yellow-black banded buoy shown in the illustration, bearing 053°T. Wha... illustration
  30. #2635 Which class of tide prevails in the greatest number of important harbors on the Atlantic Coast?
  31. #2636 You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T at 68 miles from you. What is the course to ste...
  32. #2637 Which winds are consistent winds and blow from the horse latitudes to the doldrums?
  33. #2638 What is the relative bearing of an object on the starboard beam?
  34. #2639 During the month of October, which describes the Sun's declination?
  35. #2640 Which is TRUE if the compass error of a magnetic compass has no deviation?
  36. #2641 Revolution is the __________.
  37. #2642 When entering from seaward, what does a buoy displaying a composite group (2+1) flashing red light indicate?
  38. #2643 Which term is given to the vertical angle between the horizontal and the magnetic line of force?
  39. #2644 On an isomagnetic chart, which term is used for the line of zero variation?
  40. #2645 What does a slow rise in the barometric pressure forecast?
  41. #2646 Which is the FIRST indications a mariner will have of the approach of a warm front?
  42. #2647 Which is TRUE of mean high water?
  43. #2648 Considering the general circulation of the atmosphere, what is the name given to the wind system between latitudes 30°N and 60°N?
  44. #2649 Prior to reading an aneroid barometer, why should you tap the face lightly with your finger?
  45. #2650 What does a Doppler log in the bottom return mode indicate?
  46. #2651 What color lights do lighted information markers display?
  47. #2652 Information about direction and velocity of rotary tidal currents for a Port on the Atlantic coast of the United States can be found in which publicat...
  48. #2653 Which is the only cylindrical chart projection widely used for navigation?
  49. #2654 Which is TRUE of a sea breeze?
  50. #2655 What is the MOST important feature of the material used for making the binnacle of a standard magnetic compass?
  51. #2656 The height of a wave is the vertical distance from which reference points?
  52. #2657 In the Northern Hemisphere, where will the largest waves or swells created by a typhoon or hurricane be located?
  53. #2658 What agency of the U.S. Government issues charts of U.S. waters and Coast Pilots?
  54. #2659 Red lights may appear on which buoys?
  55. #2660 The velocity of the wind, its steady direction, and the amount of time it has blown determines what about a wind driven current?
  56. #2661 What are Cirrus clouds primarily composed of?
  57. #2662 You sight an isolated danger buoy with a white flashing light showing a group of two flashes. The buoy indicates you should take which action?
  58. #2663 Which is TRUE concerning a first magnitude star?
  59. #2664 Where do you find the semidiameter correction to be used to correct sextant observations of the stars?
  60. #2665 Which scale is considered a harbor chart?
  61. #2666 Which hand held instrument is used to measure distances between objects and the ship?
  62. #2667 Which term is used to describe the wind speed and direction observed from a moving vessel?
  63. #2668 Which is TRUE for a sextant having an index error that is "on the arc"?
  64. #2669 How are buoys which mark isolated dangers painted?
  65. #2670 What is the equivalent of 10 min. 52 sec. in arc units?
  66. #2671 Which defines the controlling depth of the river?
  67. #2672 Restricted areas at locks and dams are indicated by which method?
  68. #2673 Which is TRUE if the compass heading and the magnetic heading are the same?
  69. #2674 On 2 October 2023, you will be docking at the Dundalk Marine terminals in Baltimore, MD at the second low tide. The berth is located between NOAA refe... illustration
  70. #2675 Which is a feature of a special daymark?
  71. #2676 The owner or Master of a towing vessel must ensure that each person that directs and controls the movement of the vessel knows all of the following EX...
  72. #2677 Information markers, when lighted, will display which color light?
  73. #2678 Deviation in a compass is caused by which of the following?
  74. #2679 When does a Doppler speed log indicate speed over ground?
  75. #2680 Which is TRUE of a preferred-channel buoy?
  76. #2681 How does the temperature change with the passage of an occluded front?
  77. #2682 Which piece of navigational safety equipment is NOT required on towing vessels over 12 meters in length, provided that the vessel remains within the n...
  78. #2683 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?
  79. #2684 Two beacons form a range in the direction of 221.5°T. The range is seen in line from your vessel bearing 223° per gyrocompass. The variation in the ar...
  80. #2685 The luminous range of a light takes into account which factor?
  81. #2686 Which radar control shortens all echoes on the display and reduces clutter caused by rain or snow?
  82. #2687 The velocity of a rotary tidal current will be decreased when the Moon is at which phase?
  83. #2688 While steaming on course 280°T, you sight a buoy showing a very quick flashing (VQ) white light well to port. Maintaining course, you sight another bu...
  84. #2689 Which is TRUE concerning Spring tides?
  85. #2690 Which light characteristic may be used on a special mark?
  86. #2691 How may a spherical buoy be identified?
  87. #2692 In the U.S. Aids to Navigation System on the Western Rivers, the light characteristic of group flashing (2) is used for which purpose?
  88. #2693 Your vessel is on a course of 343°T at 14 knots. At 2156 a light bears 320.5°T, and at 2217 the light bears 298°T. At what time and distance off will...
  89. #2694 Which is TRUE concerning Light Lists for coastal waters?
  90. #2695 When using GPS without Selective Availability, what can you expect your horizontal accuracy to be of the unit?
  91. #2696 Where are buoys and day beacons exhibiting a yellow triangle or square painted on them used?
  92. #2697 What does a white buoy with an orange circle marked on it indicate?
  93. #2698 On 2 October 2023, you will be docking at the Dundalk Marine terminals in Baltimore, MD at the second high tide. The berth is located between NOAA ref... illustration
  94. #2699 Which term defines the paths of intended travel between three or more points?
  95. #2700 Which is the difference between the DR position and a fix, both of which have the same time?
  96. #2701 Your vessel is located at position "I" on the illustrated weather map. You should experience which weather condition? illustration
  97. #2702 During the winter months, which is TRUE of the southeast trade winds?
  98. #2703 Under which circumstances is the dumping of refuse in a lock permitted?
  99. #2704 A chart with a scale of 1:80,000 would fall into which category?
  100. #2705 What does a white buoy with an orange cross within a diamond marked on it indicate?

General Navigation questions: what to expect

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

There are 2,639 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.