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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 1,501–1,600 of 2,639 · page 16 of 27

  1. #1607 The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
  2. #1608 The period of revolution of the Moon is __________.
  3. #1609 The period of rotation of the Moon on its axis is __________.
  4. #1610 The Moon is nearest to the Earth at __________.
  5. #1611 At upper transit, if the zenith distance is 34°, the geographical distance from the observer to a body's GP is __________.
  6. #1612 The Moon is farthest from the Earth at __________.
  7. #1613 The angle at the pole measured through 180°From the prime meridian to the meridian of a point is known as __________.
  8. #1614 The equation of time is 8m 00s. The mean Sun is ahead of the apparent Sun. If you are 2°W of the central meridian of your time zone, when will the app...
  9. #1615 During daylight savings time the meridian used for determining the time is located farther __________.
  10. #1616 In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.
  11. #1617 What condition exists at apogee?
  12. #1618 What condition exists at perigee?
  13. #1619 The major problem with Moon sights is the __________.
  14. #1620 Upper limb observations of the Moon are used more frequently than those of the Sun because of the location of the Moon in the sky and the __________.
  15. #1621 What happens because of augmentation?
  16. #1622 When taking stars, those bodies to the east and west will __________.
  17. #1623 In low latitudes, a first quarter Moon will always rise at about __________.
  18. #1624 A navigator fixing a vessel's position by radar __________.
  19. #1625 In low latitudes, the new Moon will always rise at about __________.
  20. #1626 In order for a star to be used for a sight at lower transit, the star must __________.
  21. #1627 In the celestial equator system of coordinates what is NOT equivalent to the longitude of the Earth system of coordinates?
  22. #1628 At about GMT 1436, on 3 December, the lower limb of the Moon is observed with a sextant having an index error of 2.5' on the arc. The height of eye is...
  23. #1629 In low latitudes, a last quarter moon will always rise at about __________.
  24. #1630 Some places maintain a zone time of -13. What are the time and date at Greenwich if the zone time and date are 2152, 10 January?
  25. #1631 The new Moon cannot be seen because the Moon is __________.
  26. #1632 The Sun's center may be coincident with both the celestial equator and the observer's prime vertical circle when __________.
  27. #1633 You should plot a dead reckoning position after every __________.
  28. #1634 In which of the following does the arc of a great circle pass through a body and the celestial poles?
  29. #1635 Concerning a celestial observation, the azimuth angle is measured from the principal vertical circle to the __________.
  30. #1636 A vessel crossing a river on the Western Rivers has the right of way over __________.
  31. #1637 A celestial body will cross the prime vertical circle when the latitude is numerically __________.
  32. #1638 The great circle on the celestial sphere that passes through the zenith and the north and south poles is the __________.
  33. #1639 You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________.
  34. #1640 A chart position enclosed by a semi-circle is a(n) __________.
  35. #1642 The prime vertical is the reference point from which the angle of which type of observation is measured?
  36. #1644 When possible, a DR plot should always be started from where?
  37. #1645 When applying a dip correction to the sighted sextant angle (hs), you always subtract the dip because you are correcting __________.
  38. #1646 On 25 December you observe the Sun's lower limb. The sextant altitude (hs) is 4°06.9'. The height of eye is 47 feet and the index error is 1.6' on the...
  39. #1647 If an observer is at 35°N latitude, his zenith is __________.
  40. #1648 Sidereal hour angle is always __________.
  41. #1649 A time diagram is a diagram on the plane of the __________.
  42. #1650 The change in the length of the day becomes greater as latitude increases because of the __________.
  43. #1651 The test of a towing vessel's steering gear control system includes each item EXCEPT __________.
  44. #1652 The angle that is measured westward from the first point of Aries to the hour circle of the body along the celestial equator is the __________.
  45. #1653 The type of current which will have the greatest effect on the course made good for your vessel is __________.
  46. #1654 The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the _____...
  47. #1655 If you are the Master of a towing vessel whose only working radar no longer functions, what must you do?
  48. #1656 The small circle of the celestial sphere parallel to the celestial equator, and transcribed by the daily motion of the body, is called the __________.
  49. #1657 In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates?
  50. #1658 The zenith is the point on the celestial sphere that is __________.
  51. #1659 If the right ascension of a body is 9 hours, it also __________.
  52. #1660 The point on the celestial sphere that is directly over the observer is the __________.
  53. #1661 In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system?
  54. #1662 The nadir is the point on the celestial sphere that is __________.
  55. #1663 Zenith distance is equal to __________.
  56. #1664 Daylight savings time is a form of zone time that adopts the time __________.
  57. #1665 90° - Ho = __________.
  58. #1666 The measurement of local time is based on the passage of the Sun over the __________.
  59. #1668 What is the equivalent of 83°29.6' in time units?
  60. #1669 The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value?
  61. #1670 In working out a local apparent noon sight for your latitude, you subtract the Ho from 90°. The 90° represents the angular distance from __________.
  62. #1671 If the Sun's observed altitude is 54°30', what is the zenith distance?
  63. #1672 If the Sun's observed altitude is 27°12', the zenith distance is __________.
  64. #1673 In the horizon system of coordinates what is equivalent to latitude on the Earth?
  65. #1675 In the horizon system of coordinates what is equivalent to the declination of the equator system?
  66. #1676 In the horizon system of coordinates what is equivalent to the local hour angle of the celestial equator system?
  67. #1677 The GHA of the first point of Aries is 315° and the GHA of a planet is 150°. What is the right ascension of the planet?
  68. #1678 Right ascension is primarily used by the navigator for __________.
  69. #1679 The maximum difference between mean time and apparent time is __________.
  70. #1680 The angle measured from the observer's meridian, clockwise or counterclockwise up to 180°, to the vertical circle of the body is the __________.
  71. #1681 When the time is based on the movement of the visible Sun along the ecliptic the time is known as __________.
  72. #1682 The GMT is 0445 and your zone description is +1. Your zone time is __________.
  73. #1683 The celestial coordinate of a star that is relatively constant in value is the __________.
  74. #1684 The GHA of a star __________.
  75. #1686 The ecliptic is __________.
  76. #1687 The navigator is concerned with three systems of coordinates. Which system is not of major concern?
  77. #1688 What is NOT a side of the navigational triangle used in sight reduction?
  78. #1689 17 degrees of latitude is equal to __________.
  79. #1690 You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse?
  80. #1691 A line on the Earth parallel to the equator is a __________.
  81. #1692 Sidereal time is used by navigators when __________.
  82. #1693 A parallel of latitude other than the equator is a __________.
  83. #1695 The distance between any two meridians measured along a parallel of latitude __________.
  84. #1697 On 16 January, you take a sight of a star. The sextant altitude (hs) is 4°33.0'. The temperature is -10°C, and the barometer reads 992 millibars. The...
  85. #1698 During one synodic rotation, a body makes one complete turn relative to the __________.
  86. #1699 Which is NOT a side of the celestial navigational triangle?
  87. #1700 The navigator aboard a ship at approximately 165°E longitude observes the Sun at ZT 14-25-04 on 21 September. What is the GMT and Greenwich date of th...
  88. #1701 A vertex of the navigational triangle is NOT located at the __________.
  89. #1702 A towing vessel is NOT required to be fitted with radar if it is __________.
  90. #1704 What great circle is always needed to form the astronomical triangle?
  91. #1705 The navigational triangle uses parts of two systems of coordinates, one of which is the celestial equator system, the other system is the __________.
  92. #1706 The navigational triangle uses parts of two systems of coordinates, one of which is the horizon system and the other is the __________.
  93. #1707 The owner or Master of a towing vessel shall ensure that all tests and inspections of gear take place and are logged __________.
  94. #1708 In the navigational triangle, the angle at the elevated pole is the __________.
  95. #1711 The correction tables in the front of the Nautical Almanac for use with sun sights do NOT include the effects of __________.
  96. #1712 The azimuth angle of a sun sight is always measured from the __________.
  97. #1713 The owner or Master of a towing vessel shall ensure that each person that directs and controls the movement of the vessel can accurately fix the vesse...
  98. #1715 The date is the same all over the world at __________.
  99. #1716 What is the geographic longitude of a body whose GHA is 215°15'?
  100. #1718 A phase correction is applied to observations of __________.

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.