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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 1,401–1,500 of 2,639 · page 15 of 27

  1. #1496 Because the actual center of some planets may differ from the observed center, the navigator applies a correction known as the __________.
  2. #1497 At morning stars, the last stars that should be observed are those with an azimuth in which quadrant?
  3. #1498 A rock and sand structure extending from the bank of the river toward the channel is known as a __________.
  4. #1499 Capella is found in what constellation?
  5. #1501 You are outbound in a channel marked by a range astern. The range line is 133°T. You are steering 315°T and have the range in sight as shown in illust... illustration
  6. #1502 You are steering a southerly course, and you note that the chart predicts an easterly current. Without considering wind, how may you allow for the set...
  7. #1503 What describes an accurate position that is NOT based on any prior position?
  8. #1504 It is 1200 local time for an observer at 54°E longitude. Which statement is TRUE?
  9. #1506 When attempting an upstream landing while pushing empty barges ahead in a hard onshore wind, the approach is best made __________.
  10. #1507 You are in a channel in U.S. waters near an industrial plant with a load/discharge facility for barges. You hear a siren being sounded at the facility...
  11. #1508 Denebola is found in what constellation?
  12. #1509 What sextant correction corrects the apparent altitude to the equivalent reading at the center of the Earth?
  13. #1510 The magnitude of three stars is indicated. Which star is the brightest?
  14. #1511 The owner or Master of a towing vessel that is operating within a Vessel Traffic Service (VTS) area must report specific information to the service. W...
  15. #1512 Inferior conjunction is possible for __________.
  16. #1513 On the Western Rivers, a vessel crossing a river must __________.
  17. #1515 What term is used to describe a tank barge constructed with the structural framing outside the cargo tank and the cargo tank plating separated from th...
  18. #1517 In the celestial equator system of coordinates what is equivalent to the longitude of the Earth system of coordinates?
  19. #1518 You are pushing a tow ahead, at high speed, near the right hand bank of a canal. The forces affecting your towboat and tow will tend to __________.
  20. #1519 When pushing barges ahead close to a steep revetment where there is no current, what is MOST likely to occur?
  21. #1520 If a chart indicates the depth of water to be 6 fathoms and your draft is 6.0 feet, what is the depth of the water under your keel? (Assume the actual...
  22. #1521 Superior conjunction occurs when __________.
  23. #1522 The Earth has the shape of a(n) __________.
  24. #1523 On 6 July, at 1000 zone time, you cross the 180th meridian steaming westward. What is your local time?
  25. #1524 Opposition occurs when __________.
  26. #1525 Lines of position may be __________.
  27. #1526 The spinning motion of a planet around its axis is called __________.
  28. #1527 The parallel of latitude at 23°27'N is the __________.
  29. #1528 A deadhead is a(n) __________.
  30. #1529 Mars is only seen at two phases, one of which __________.
  31. #1530 In general, the most effective period for observing stars and planets occurs during the darker limit of __________.
  32. #1531 You are running parallel to the coast and take a running fix using bearings of the same object. If you are making less speed than used for the running...
  33. #1532 Mars will not be visible __________.
  34. #1533 The planet Venus can be observed in the morning before sunrise if it is well to the __________.
  35. #1535 Which is an inferior planet?
  36. #1536 In low latitudes, the full Moon will always rise at about __________.
  37. #1537 In the celestial equator system of coordinates, what is comparable to latitude on the terrestrial sphere?
  38. #1538 You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?
  39. #1539 What is the brightest navigational planet?
  40. #1540 In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03°35.5'. Your height of eye is 32 feet and there is no i...
  41. #1541 When making landfall at night, you can determine if a light is a major light or an offshore buoy by _________.
  42. #1542 The first point of Aries is the point where the Sun is at __________.
  43. #1543 Other than the Sun and Moon, the brightest object in the sky is __________.
  44. #1544 What is the relative bearing of an object broad on the starboard quarter?
  45. #1545 At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is...
  46. #1546 Your longitude is 179°59'W. The LMT at this longitude is 23h 56m on the 4th day of the month. Six minutes later, your position is 179°59'E longitude....
  47. #1547 If the GMT is 1500, the time at 75°E longitude is __________.
  48. #1548 What celestial body may sometimes be observed in daylight?
  49. #1549 The largest of the navigational planets is __________.
  50. #1550 The parallel of latitude at 66°33'N is the __________.
  51. #1551 The parallel of latitude at 23°27'S is the __________.
  52. #1552 The GP of a body for a high altitude sight is determined from the Greenwich hour angle and the __________.
  53. #1553 The precession of the equinoxes occurs in a(n) __________.
  54. #1554 The daily path of a celestial body that is parallel to the celestial equator is the __________.
  55. #1555 At meridian transit, the diagram used by a navigator to illustrate the angles involved is based on the __________.
  56. #1556 At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile west of your DR. Which statement is...
  57. #1557 In the horizon system of coordinates what is the equivalent to the meridians on the Earth?
  58. #1558 When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________.
  59. #1559 Why are low altitude sun sights not generally used?
  60. #1561 A line of position is __________.
  61. #1562 Which is TRUE on the Western Rivers when a vessel downbound with a following current is meeting an upbound vessel?
  62. #1563 What is the longitude of the geographical position of a body whose Greenwich hour angle is 210°30'?
  63. #1565 The precession of the equinoxes of the Earth is __________.
  64. #1566 The principal vertical circle is that great circle on the celestial sphere that passes through the __________.
  65. #1567 The spinning of a celestial body about its axis is known as __________.
  66. #1568 The owner or Master of a towing vessel shall ensure that each person that directs and controls the movement of the vessel can accomplish all of the fo...
  67. #1570 The direction in which a vessel is steered is the course. The path actually followed is the __________.
  68. #1571 The error in a sextant altitude caused by refraction is greatest when the celestial body is __________.
  69. #1572 What is the equivalent of 10°48' in time units?
  70. #1573 "Rotation" is the __________.
  71. #1574 Vessels regularly navigating Ohio and Mississippi rivers above Cairo, Illinois, and their tributaries, shall at all times have on board a copy of ____...
  72. #1575 You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix?
  73. #1578 A towing vessel is NOT required to be fitted with radar if it is __________.
  74. #1579 Astronomical refraction causes a celestial body to appear __________.
  75. #1580 A celestial body's complete orbit around another body is __________.
  76. #1581 During daylight savings time the meridian used for determining the time is located farther __________.
  77. #1582 "Revolution" is the __________.
  78. #1583 "Space motion" is the __________.
  79. #1584 The approximate positions of the stars are based on sidereal time, which is based upon rotation of the Earth relative to __________.
  80. #1585 Which towing vessel(s) is/are exempt from carrying radar?
  81. #1586 The motion of celestial bodies relative to other celestial bodies is known as __________.
  82. #1587 The radius of a circle of equal altitude for a body equals the body's __________.
  83. #1588 The Sun is closest to the Earth in what month?
  84. #1589 Perihelion is the point where the Sun __________.
  85. #1590 Which is TRUE of a downbound power-driven vessel, when meeting an upbound vessel on the Western Rivers?
  86. #1591 What is the relative bearing of an object broad on the port beam?
  87. #1593 Aphelion is the point where the Sun __________.
  88. #1594 The Sun's center is coincident with the principal vertical circle when __________.
  89. #1595 During the month of October the Sun's declination is __________.
  90. #1596 The equator is __________.
  91. #1597 What is the equivalent of 4 min. 04 sec. in arc units?
  92. #1598 The point where the Sun is at maximum declination north or south is __________.
  93. #1599 Which information is NOT required to be posted in or near the wheelhouse?
  94. #1600 You are on a vessel at 0400 ZT on 3 July, and the ZD for your position is -8. What is the GMT?
  95. #1601 A body can only be observed at lower transit when __________.
  96. #1602 How many fixed objects are needed to plot a running fix?
  97. #1603 The difference between local apparent time (LAT) and local mean time (LMT) is indicated by the __________.
  98. #1604 The autumnal equinox is the point where the Sun is at __________.
  99. #1605 The summer solstice is the point where the Sun is at __________.
  100. #1606 The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?

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.