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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 1,901–2,000 of 2,639 · page 20 of 27

  1. #2047 The sidereal day begins when the __________.
  2. #2048 The period at high or low tide during which there is no change in the height of the water is called the __________.
  3. #2050 You are outbound in a buoyed channel on course 015°T. You sight a white light showing a Morse (A) characteristic bearing 359° relative. For sa...
  4. #2056 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...
  5. #2057 You are underway on course 328°T when you sight a buoy broad on your port bow. You are in the best navigable water if the buoy __________.
  6. #2059 You are on course 090°T when you sight a flashing white light with a characteristic of VQ(9)10s. You immediately change course to 030°T. After...
  7. #2061 You are underway on course 127°T. You sight a buoy with the topmarks shown in illustration D025NG below, bearing two points on the starboard bow.... illustration
  8. #2064 While proceeding along the Mediterranean coast of Spain, you sight the black and yellow buoy shown in illustration D020NG below. Your course is 039&de... illustration
  9. #2065 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...
  10. #2074 You wish to measure the distance on a Mercator chart between a point in latitude 43°30'N and a point in latitude 40°30'N. To measure 30 miles...
  11. #2075 To measure distance on a Mercator chart between the parallels of LAT 34°30'N and LAT 31°30'N, which 30 mile scale should be used?
  12. #2078 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...
  13. #2079 Civil twilight begins at 1910 zone time on 20 July. Your DR position at that time is LAT 22°16'N, LONG 150°06'W. Which statement concerning th...
  14. #2098 The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation shou...
  15. #2099 The chart indicates the variation was 3°45'W in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation shou...
  16. #2100 The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1991 how much variation shou...
  17. #2101 The points on the earth's surface where the magnetic dip is 90° are __________.
  18. #2102 Your radar has a beam width of 2°. The radar gyro bearing of the right tangent of an island is 316°. The gyro error is 1°E. Which true bea...
  19. #2103 While underway vessels equipped with an automatic identification system (AIS) are required to transmit specific information at varying intervals. What...
  20. #2104 You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 080°T, 100 miles from your position. The hur...
  21. #2105 In illustration D009NG below, your position X is at LAT 35°S. Which winds are you experiencing? illustration
  22. #2106 You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042° at 105 miles from you. What is the course...
  23. #2107 Your vessel is on course 150°T, speed 17 knots. The apparent wind is from 40° off the starboard bow, speed 15 knots. What is the speed of the...
  24. #2110 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The sky is... illustration
  25. #2111 You are underway on course 050°T and your maximum speed is 13 knots. The eye of a hurricane bears 120°T, 100 miles from your position. The hur...
  26. #2112 Your vessel is on course 270°T, speed 10 knots. The apparent wind is from 10° off the port bow, speed 30 knots. From which direction is the tr...
  27. #2113 Tropical cyclones do not form within 5° of the Equator because __________.
  28. #2114 When the index and horizon mirrors of a properly adjusted sextant are at an angle of 45° to each other, the arc reads __________.
  29. #2115 You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042°T, 105 miles from you. What is the time to...
  30. #2116 Because of the reflecting properties of a sextant, if the sextant altitude reads 60° on the limb, the actual arc of the limb from 0° to the 60...
  31. #2117 A ship is on course 195° at a speed of 15 knots. The apparent wind is from 40° on the port bow, speed 30 knots. The direction and speed of the...
  32. #2118 The beam width of your radar is 2°. The left tangent bearing of a small island, as observed on the PPI scope, is 056°pgc. If the gyro error is...
  33. #2119 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. You are hov... illustration
  34. #2123 You are underway on course 120°T and your maximum speed is 12 knots. The eye of a hurricane bears 150°T, 120 miles from your position. The hur...
  35. #2125 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Your positi... illustration
  36. #2126 Your vessel is participating in the Voluntary Observing Ship Program, at 1800 ZT on 31 October your position is LAT 24°50'N, LONG 92°37'W. You... illustration
  37. #2128 You are underway on course 050°T and your maximum speed is 11 knots. The eye of a hurricane bears 070°T, 80 miles from your position. The hurr...
  38. #2129 You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5 mile, 1 mile, and 1...
  39. #2130 Your vessel is participating in the Voluntary Observing Ship Program, at 1200 ZT on 31 August, your position is LAT 43°14'S, LONG 175°44'E. Yo... illustration
  40. #2131 Prevailing winds between 30°N and 60°N latitude are from the __________.
  41. #2132 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The dry bul... illustration
  42. #2133 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. One-half of... illustration
  43. #2134 You are enroute to assist vessel A. Vessel A is underway at 5 knots on course 063°T, and bears 136°T at 78 miles from you. What is the course...
  44. #2135 You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 284°T at 43 miles from you. What is the cours...
  45. #2136 You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 120°T, 110 miles from your position. The hur...
  46. #2137 You are using a radar in which your own ship is shown at the center, and the heading flash always points to 0°. If bearings are measured in relati...
  47. #2139 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 cours...
  48. #2140 You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 346°T at 68 miles from you. What is the cours...
  49. #2141 You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the cours...
  50. #2142 You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 343°T at 92 miles from you. What is the course...
  51. #2143 You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 343°T at 92 miles from you. What is the time to...
  52. #2144 You are enroute to assist vessel A. Vessel A is underway at 4.5 knots on course 233°T, and bears 264°T, 68 miles from you. What is the time to...
  53. #2145 You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 248°T at 64 miles from you. What is the time...
  54. #2146 You are enroute to assist vessel A. Vessel A is underway at 5.5 knots on course 033°T, and bears 284°T, 43 miles from you. What is the time to...
  55. #2147 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The dry bul... illustration
  56. #2148 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The dry bul... illustration
  57. #2149 Your vessel is participating in the Voluntary Observing Ship Program, at 0600 ZT on 31 January your position is LAT 00°49'S, LONG 84°27'E. You... illustration
  58. #2150 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. The dry bul... illustration
  59. #2151 You are underway on course 050°T and your maximum speed is 13 knots. The eye of a hurricane bears 100°T, 120 miles from your position. The hur...
  60. #2152 Your vessel is participating in the Voluntary Observing Ship Program, at 1200 ZT on 31 July, your position is LAT 24°33'N, LONG 173°05'W. You... illustration
  61. #2153 Your vessel is participating in the Voluntary Observing Ship Program, you are preparing WS Form B-80 as seen in illustration D041NG below. Twenty-five... illustration
  62. #2154 You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurr...
  63. #2155 You are underway on course 050°T and your maximum speed is 13 knots. The eye of a hurricane bears 100°T, 120 miles from your position. The hur...
  64. #2156 You are underway on course 050°T and your maximum speed is 10 knots. The eye of a hurricane bears 100°T, 90 miles from your position. The hurr...
  65. #2157 You are underway on course 120°T and can make 12 knots. The eye of a hurricane bears 150°T at 120 miles. The hurricane is on course 295° a...
  66. #2158 You are underway on course 050°T and your maximum speed is 11 knots. The eye of a hurricane bears 070°T, 80 miles from your position. The hurr...
  67. #2159 You are underway on course 050°T and your maximum speed is 12 knots. The eye of a hurricane bears 080°T, 100 miles from your position. The hur...
  68. #2160 If your mercurial barometer reads 30.50 inches (1033 millibars) and the temperature is 56°F (13°C), what is the correct reading at 55°N, 1...
  69. #2162 Considering the general circulation of the atmosphere, the wind system between latitudes 30°N and 60°N is commonly called the __________.
  70. #2163 The region of high pressure extending around the Earth at about 35°N latitude is called the __________.
  71. #2164 The prevailing winds in the band of latitude from approximately 5°N to 30°N are the __________.
  72. #2165 Your ship is proceeding on course 320°T at a speed of 25 knots. The apparent wind is from 30° off the starboard bow, speed 32 knots. What is t...
  73. #2166 Your vessel is on course 180°T speed 22 knots. The apparent wind is from 70° off the port bow, speed 20 knots. The true direction and speed of...
  74. #2168 The dry-bulb temperature is 78°F and the wet-bulb temperature is 62°F. What is the relative humidity?
  75. #2169 The dry-bulb temperature is 78°F (26°C) and the wet-bulb temperature is 68°F (20°C). What is the relative humidity?
  76. #2170 A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?
  77. #2171 You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse?
  78. #2172 You are on course 030°T. The relative bearing of a lighthouse is 45°. What is the true bearing?
  79. #2173 In working out a local apparent noon sight for your latitude, you subtract the Ho from 90°. The 90° represents the angular distance from _____...
  80. #2174 The LMT of sunrise on the standard meridian is 0552. Your longitude is 99°15'E. What is your ZT of sunrise?
  81. #2176 You are on course 180°T and take a relative bearing of a lighthouse of 225°. What is the true bearing of the lighthouse?
  82. #2177 You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix?
  83. #2179 If the Sun's observed altitude is 47°50', the zenith distance is __________.
  84. #2180 The parallel of latitude at 23°27'N is the __________.
  85. #2181 You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix?
  86. #2182 You take a bearing of 142° and 259° of two objects. Which bearing of a third object will give the best fix?
  87. #2184 You are on course 209°T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing?
  88. #2185 You are on course 344°T and take a relative bearing of a lighthouse of 090°. What is the true bearing to the lighthouse?
  89. #2186 What is the longitude of the geographical position of a body whose Greenwich hour angle is 210°30'?
  90. #2187 You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range...
  91. #2188 Your longitude is 179°59'W. The LMT at this longitude is 23h 56m of the 4th day of the month. Six minutes later your position is 179°59'E long...
  92. #2189 At upper transit, if the zenith distance is 34°, the geographical distance from the observer to a body's GP is __________.
  93. #2190 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...
  94. #2191 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 _...
  95. #2192 You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown in illust... illustration
  96. #2193 You are on course 027°T and take a relative bearing to a lighthouse of 220°. What is the true bearing to the lighthouse?
  97. #2194 You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse?
  98. #2195 You are on course 277°T and take a relative bearing of a lighthouse of 045°. What is the true bearing to the lighthouse?
  99. #2196 You are on course 180°T and take a relative bearing of a lighthouse of 225°. What is the true bearing of the lighthouse?
  100. #2199 You take a bearing of 176° of a lighthouse. Which bearing of another object would give the best fix?

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.