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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 401–500 of 2,138 · page 5 of 22

  1. #419 Your height of eye is 40 feet (12.2 meters). What is the approximate geographical distance at which Ambrose Light, NY, could be visible? Refer to "Rep...
  2. #420 A mountain peak charted at 700 feet breaks the horizon, and your height of eye is 12 feet. What is your approximate distance off (choose closest answe...
  3. #421 What is the approximate geographic range of Point Judith Light, Rhode Island, if your height of eye is 62 feet (18.9 meters)? Refer to "Reprints from...
  4. #422 What is the approximate geographic range of Shinnecock Light, NY, if your height of eye is 24 feet (7.3 meters)? Refer to "Reprints from the LIGHT LIS...
  5. #423 What is the approximate geographic range of Southwest Ledge Light, Connecticut, if your height of eye is 32 feet (9.8 meters)? Refer to "Reprints from...
  6. #424 What is the approximate geographic range of Assateague Light, VA, if your height of eye is 52 feet (15.8 meters)? Refer to "Reprints from the LIGHT LI...
  7. #425 When navigating in high latitudes and using a chart based on a Lambert conformal projection, __________.
  8. #426 On a gnomonic chart, a great circle track between Los Angeles and Brisbane will appear as a __________.
  9. #427 All straight lines represent great circle tracks on a chart based on a(n) __________.
  10. #428 The only cylindrical chart projection widely used for navigation is the __________.
  11. #429 A Mercator chart is a __________.
  12. #430 You wish to measure the distance on a Mercator chart between a point in latitude 42°30'N and a point in latitude 40°30'N. To measure 30 miles at a tim...
  13. #431 Which statement is TRUE concerning a Mercator projection?
  14. #432 Distance along a track line is measured on a Mercator chart by using the __________.
  15. #433 On a Mercator chart, 1 nautical mile is equal to __________.
  16. #434 What area of the earth cannot be shown on a standard Mercator chart?
  17. #435 A coastal chart could have a scale of __________.
  18. #436 A harbor chart could have a scale of __________.
  19. #437 Charts showing the coast of Mexico are produced by the United States __________.
  20. #438 The agonic line on an isomagnetic chart indicates the __________.
  21. #439 How is variation indicated on a small-scale nautical chart?
  22. #440 On a nautical chart, the inner ring of a compass rose indicates __________.
  23. #441 The revision date of a chart is printed on which area of the chart?
  24. #442 A chart has extensive corrections to be made to it. When these are made and the chart is again printed, the chart issue is a __________.
  25. #443 What information is found in the chart title?
  26. #444 The survey information upon which a chart is based is found __________.
  27. #445 What information is NOT found in the chart title?
  28. #446 The value of sixty nautical miles per degree of geodetic latitude is most correct at __________.
  29. #447 What is the length of a nautical mile?
  30. #448 NGA (NIMA) charts are adopting the metric system. In order to change a charted depth in meters to feet you may use the conversion table found ________...
  31. #449 The compass rose on a nautical chart indicates both variation and __________.
  32. #450 The navigation regulations applicable to a U.S. inland waterway can be found in the __________.
  33. #451 On the Mississippi River, gage zero is the gage reading measured from the __________.
  34. #452 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 clear...
  35. #453 Navigation charts of the Upper Mississippi River are published by __________.
  36. #454 The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel __________.
  37. #455 The Light List shows a lighted aid to navigation on the right bank. This means that the light can be seen on the port side of a vessel __________.
  38. #456 The Light List shows a lighted aid to navigation on the right bank. This means that the light can be seen on the starboard side of a vessel __________...
  39. #457 In which source could you find the vertical clearance of a bridge on the Ohio River?
  40. #458 When utilizing a Pacific Coast chart, the reference plane of soundings is __________.
  41. #459 Mean lower low water is the reference plane used for __________.
  42. #460 Charted depth is the __________.
  43. #461 The shoreline on charts generally represents the mean __________.
  44. #462 Mean high water is used __________.
  45. #463 The description "Racon" beside an illustration on a chart would mean a __________.
  46. #465 Which of the buoy symbols shown in illustration D032NG below indicates a safe water mark? illustration
  47. #466 Which statement concerning the chartlet in illustration D010NG below is true? (Soundings and heights are in meters) illustration
  48. #467 Chart legends which indicate a conspicuous landmark are printed in __________.
  49. #468 Which aid is NOT marked on a chart with a magenta circle?
  50. #469 Entering from sea, a daymark on the port side of the channel would be indicated on a chart by a __________.
  51. #470 The buoy symbol printed on your chart is leaning to the northeast. This indicates __________.
  52. #471 The symbol which appears beside a light on a chart reads "Gp Fl R (2) 10 sec 160 ft 19M". Which characteristic describes the light?
  53. #472 Sometimes foreign charts are reproduced by NGA. On such a chart a wire dragged (swept) area may be shown in purple or __________.
  54. #473 The depth of the water is indicated on a chart as 32 meters. This is equal to __________.
  55. #474 Which symbol represents a 20-fathom curve?
  56. #475 Which symbol represents a 10-fathom curve?
  57. #476 Which symbol represents a 2-fathom curve?
  58. #478 On U.S. charts, you can tell if a named feature such as a rock (i.e. Great Eastern Rock in Block Island Sound) is submerged by the __________.
  59. #479 When slanted letters are used to spell the name of a charted object you know the __________.
  60. #480 If you are sailing from the East Coast of the United States to the Caribbean Sea, which publication would contain information on weather, currents, an...
  61. #481 Which would you consult for information about the general current circulation in the North Atlantic Ocean?
  62. #482 A pilot chart does NOT contain information about __________.
  63. #483 If you were sailing in the North Pacific and were interested in the ice and iceberg limits, you could find this information in the __________.
  64. #484 What publication contains descriptions of the coast line, buoyage systems, weather conditions, port facilities, and navigation instructions for the Un...
  65. #485 Which government agency publishes the U.S. Coast Pilot?
  66. #486 Which table is NOT found in the U.S. Coast Pilots?
  67. #487 You are planning to enter an unfamiliar U.S. port. Which publication provides information about channel depths, dangers, obstructions, anchorages, and...
  68. #488 The National Ocean Service publishes the __________.
  69. #489 Which publication should you check for complete information on Puget Sound weather conditions?
  70. #490 Which publication contains information on navigation regulations, landmarks, channels, anchorages, tides, currents, and clearances of bridges for Ches...
  71. #491 It is unlawful to approach within how many yards of a northern right whale?
  72. #492 If within 500 yards (460m) of a Northern Right Whale you are lawfully obligated to __________.
  73. #493 What publication has information on the climate, distances, navigation regulations, outstanding landmarks, channels and anchorages of Long Island Soun...
  74. #494 The population of northern right whales, an endangered species, numbers approximately __________.
  75. #495 A vessel sighting a northern right whale dead ahead should __________.
  76. #496 You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in __________.
  77. #497 You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in __________.
  78. #498 Light Lists for coastal waters are __________.
  79. #500 Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the...
  80. #501 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?
  81. #502 The Light List Does NOT contain information on __________.
  82. #503 How is the intensity of a light expressed in the Light Lists?
  83. #504 Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States?
  84. #505 Which agency maintains federal aids to navigation?
  85. #506 Civil twilight occurs at 0558 zone time on 30 December. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the pla...
  86. #507 When determining compass error by an azimuth of Polaris, you enter the Nautical Almanac with the __________.
  87. #508 In the Nautical Almanac provided, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars?
  88. #510 The values of the Greenwich hour angle and declination, tabulated in all almanacs, are for the __________.
  89. #511 The refraction correction table given in the Nautical Almanac is based on a standard or average atmospheric density with a temperature of 50°F (10°C)...
  90. #512 What is the major limitation in using the Sight Reduction Tables for Air Navigation Volume I (Pub. No. 249) for star sights?
  91. #513 The principal advantage of NAVTEX radio warnings is that __________.
  92. #514 A HYDROLANT warning would normally be sent for all of the following EXCEPT __________.
  93. #515 What is a "Special Warning"?
  94. #516 Which would be the subject of a NAVAREA warning?
  95. #517 The Coast Guard broadcasts urgent marine storm warning messages on which of the following frequencies?
  96. #518 Which statement about radio navigational warnings is TRUE?
  97. #519 What U.S. agency is responsible for NAVAREA warnings?
  98. #520 The world is divided into NAVAREAS for the dissemination of important marine information. Which NAVAREAS include the U.S. coasts?
  99. #521 A NAVAREA warning carries the following number; 1986/87 (11). Which statement is TRUE?
  100. #522 The numeral in the center of a wind rose circle on a pilot chart indicates the __________.

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.