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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 2,201–2,300 of 2,639 · page 23 of 27

  1. #2406 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?
  2. #2407 In the illustration, what type of buoy is indicated by the letter A? illustration
  3. #2408 Which of the symbols shown in the illustration represents an occluded front? illustration
  4. #2409 What is the approximate wavelength of an X Band Radar operating on a frequency of approximately 9.5 GHz?
  5. #2410 Under the IALA Buoyage Systems, which is TRUE of safe water marks?
  6. #2411 You are in a buoyed channel at night and pass a lighted buoy with an irregular characteristic. Who should you report this to?
  7. #2412 If you are caught in the left semicircle of a tropical storm, in the Southern Hemisphere, which action should you take?
  8. #2413 A green buoy has a yellow triangle on it. What type of buoy is this?
  9. #2414 What is indicated when slanted letters are used to spell the name of a charted object?
  10. #2415 What does a wind vane on a moving vessel show?
  11. #2416 You plot a fix using three lines of position and find they intersect in a triangle. You should plot the position of the vessel __________.
  12. #2417 Which item in the illustration shows a fixed and flashing light? illustration
  13. #2418 How are chart legends which indicate a conspicuous landmark printed?
  14. #2419 In the IALA Maritime Buoyage System, what is a red and white vertically striped buoy used to indicate?
  15. #2420 Which defines the term charted depth?
  16. #2421 On a weather map, what does a large letter "H" indicate?
  17. #2422 What do red sectors of navigation lights warn mariners of?
  18. #2423 You are underway on course 142°T when you sight a buoy bearing 105°T. The buoy's white light has a characteristic of continuous very-quick flashing. W...
  19. #2424 What does the description "Racon" beside an illustration on a chart mean?
  20. #2425 Which is TRUE concerning wind velocity?
  21. #2426 Which cloud is described as a low, dark, sheet-like cloud which is associated with continuous precipitation for many hours?
  22. #2427 Which handheld instrument is used to measure distances between objects and the ship?
  23. #2428 While taking weather observations, you determine that the wind is coming from the west. In the weather log, how would you record the wind direction?
  24. #2429 Your longitude is 124°E, and your local mean time is 0520 on the 5th of the month. Which is the mean time and date at Greenwich?
  25. #2430 Under the U.S. Aids to Navigation System, which category is a yellow buoy?
  26. #2431 Your 1600 GRT vessel will be entering the navigable waters of the United States. You are required by regulations to take which action?
  27. #2432 What is the characteristic of a quick flashing light?
  28. #2433 Which radar control reduces weak echoes out to a limited distance from the ship?
  29. #2434 Which term is used to describe a generally circular low-pressure area?
  30. #2435 Which is a characteristic of warm air masses?
  31. #2436 Which is an area of strong westerly winds occurring between 40°S and 60°S latitude?
  32. #2437 IN REGION A of the IALA Buoyage System, when entering from seaward, how would the starboard side of a channel be marked?
  33. #2438 In a tropical cyclone in the Northern Hemisphere, a vessel hove to with the wind shifting counterclockwise, would be in which location?
  34. #2439 Which term is used for a position obtained by applying ONLY your vessel's course and speed to a known position?
  35. #2440 How can the value of a minor index error of a sextant be determined?
  36. #2441 Which of the following is a standard correction applied to the reading of an aneroid barometer?
  37. #2442 An electronic depth finder operates on which principle?
  38. #2443 Which name is given to the pressure-sensitive element of an aneroid barometer?
  39. #2444 Steam fog will occur when which conditions exists?
  40. #2445 What causes compass deviation?
  41. #2446 How are aids to navigation marking the intracoastal waterway (ICW) identified?
  42. #2447 Which is TRUE concerning weather information?
  43. #2448 Which type of cloud is hail most likely to fall from?
  44. #2449 When trying to sight a lighthouse you notice a glare from a town in the background. How does this affect the range at which the light may be sighted?
  45. #2450 How does the standard magnetic compass heading differ from the true heading?
  46. #2451 The illustration represents the geographic location of a vessel and the radar presentation at the same time. Which statement is TRUE? illustration
  47. #2452 A weather forecast states that the wind will commence veering. In the Northern Hemisphere, what changes will occur?
  48. #2453 A sidereal day is shorter than a solar day. What is the reason for this difference?
  49. #2454 The National Oceanic and Atmospheric Administration publishes which item?
  50. #2455 Safe water buoys may show ONLY which type of light?
  51. #2456 How often are the time signals broadcast by WWV and WWVH transmitted?
  52. #2457 Which term is used to describe the time interval between successive wave crests?
  53. #2458 Which defines the term relative humidity?
  54. #2459 Which type of projection is used to make a Mercator chart?
  55. #2460 How can the accuracy of an azimuth circle be checked?
  56. #2461 ECDIS must give an alarm for which of the following cases?
  57. #2462 Which is TRUE concerning the flow of air around an anticyclone in the Southern Hemisphere?
  58. #2463 Which is TRUE of a vertically striped buoy?
  59. #2464 Which term is given to magnetism which is present only when the material is under the influence of an external field?
  60. #2465 As it approaches, what will a typical warm front bring?
  61. #2466 Your vessel is on a course of 221°T at 15 knots. At 0319 a light bears 198.5°T, and at 0353 the light bears 176°T. At what time and distance off will...
  62. #2467 What does the numeral in the center of a wind rose circle on a pilot chart indicate?
  63. #2468 On what does the operation of an aneroid barometer depend?
  64. #2469 A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water is located in which quadrant?
  65. #2470 You are heading in a northerly direction when you come across an easterly current. Your vessel will respond in which manner?
  66. #2471 Which is most commonly associated with fog?
  67. #2472 Where is the West Wind Drift located?
  68. #2473 Which describes the level of database information which cannot be removed from the ECDIS display and consists of information which is required at all...
  69. #2474 The most dangerous form of icing encountered at sea is formed by which of the following?
  70. #2475 Weather systems in the middle latitudes generally travel in which direction?
  71. #2476 Which statement concerning the chartlet seen in the illustration is TRUE? (Soundings and heights are in meters) illustration
  72. #2477 What is an ebb current?
  73. #2478 When does a current perpendicular to a vessel's track have the greatest effect on the vessel's course made good?
  74. #2479 Yellow lights may appear on which buoys?
  75. #2480 Which describes the visible range marked on charts for lights?
  76. #2481 Which is TRUE concerning magnetic compass deviation?
  77. #2482 What does the prefix "nimbo" in a cloud's name mean?
  78. #2483 The dry bulb temperature is 78oF and the wet bulb temperature is 62oF. What is the relative humidity?
  79. #2484 Which is TRUE of an occulting light?
  80. #2485 Which is TRUE of the dangerous semicircle of a hurricane in the Northern Hemisphere?
  81. #2486 On a nautical chart, what does the inner ring of a compass rose indicate?
  82. #2487 What is the relative bearing of an object sighted dead ahead?
  83. #2488 Which is the most important information to be obtained from a barometer?
  84. #2489 Which is TRUE concerning the length of a wave?
  85. #2490 Which describes the result when you turn on the fast time constant (differentiator) control of a radar?
  86. #2491 Where can the annual change in variation for an area be found?
  87. #2492 You are underway on course 215°T while turning for an engine speed of 12 knots. The current is 000°T at 2.3 knots. What is the speed being made good?
  88. #2493 To predict the actual depth of water using the Tide Tables, how does one use the number obtained from the Tide Tables?
  89. #2494 Which is the name given to the belt of light and variable winds between the westerly wind belt and the northeast trade winds?
  90. #2495 At which interval should a traditional spring driven marine chronometer be rewound?
  91. #2496 Your vessel has changed course and is heading 285°T, you are on the charted range, and it appears as in Figure A. After several minutes the range appe... illustration
  92. #2497 What is magnetic dip a measurement of?
  93. #2498 Of the four light characteristics shown in the illustration which one does NOT represent a safe water mark of the IALA Buoyage System? illustration
  94. #2499 Which maritime radio system, consisting of a series of coast stations, transmits coastal warnings?
  95. #2500 A time diagram is a diagram of the celestial sphere as observed from above which location?
  96. #2501 At evening stars, the first stars that should be observed are those with an azimuth in what quadrant?
  97. #2502 The apparent wind is zero when which situation exists with the true wind?
  98. #2503 Which causes the Earth's irregular heating?
  99. #2504 What is the standard atmospheric pressure in millibars?
  100. #2505 Which line connects the points of zero magnetic dip?

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.