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Deck · 121 questions

Retired questions · Navigation Problems - USCG Exam Questions

These are retired questions the Coast Guard no longer draws exams from. They stay online for reference; the current questions are in Navigation Problems.

Worked chart problems: plotting courses and fixes, time, speed, and distance, set and drift, and compass error corrections.

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.

Random question Start at question 5 Build a timed exam

All Retired questions · Navigation Problems questions

Questions 1–100 of 121 · page 1 of 2

  1. #5 On 6 April your 0300 DR position is LAT 27°42' S, LONG 128°58' W. You are on course 097°T at a speed of 18 knots. You observed 3 celestial bodies. Det...
  2. #12 On 15 February at 0610 ZT, in DR position LAT 56°53.0' N, LONG 157°02.9' E, you observe Polaris at a sextant altitude (hs) of 56°10.4'. The index erro...
  3. #16 On 20 February your 0530 ZT DR position is LAT 24°15.0'N, LONG 137°33.0'W. You are on course 033°T at a speed of 18 knots. You observed 3 celestial bo...
  4. #21 On 22 November your vessel is enroute from Accra, Ghana to Montevideo, Uruguay. You are on course 240°T and making a speed of 15.0 knots. Your 1129 DR...
  5. #27 The speed necessary to reach port at a designated time is 18.7 knots. The propeller pitch is 24'03", and you estimate 3% positive slip. How many RPM's...
  6. #42 On 3 April your vessel's 1400 ZT DR position is LAT 20°08.0' N, LONG 147°45.0' W. You are steering course 023°T at 18.0 knots. You observed 3 celestia...
  7. #46 On 8 April your 0830 zone time DR position is LAT 22°49.0'N, LONG 84°37.0'W. Your vessel is on course 228° T at a speed of 19.0 knots. What is the zon...
  8. #55 On 17 November in DR position LAT 01°14.4'S, LONG 148°45.5'E, you take an ex- meridian observation of the planet Venus at upper transit. The chronomet...
  9. #61 On 4 September your 1813 zone time DR position is LAT 24°18.0' S, LONG 95°16.0' E. Considering their magnitude, azimuth, and altitude, which group inc...
  10. #62 On 16 October evening twilight will occur at 1746 ZT. Your DR position will be LAT 28°43.2' N, LONG 60°29.8' W. Considering their magnitude and locati...
  11. #63 On 30 March in DR position LAT 20°26.2'N, LONG 131°17.9'E, you take an ex- meridian observation of the Moon's lower limb at upper transit. The chronom...
  12. #72 On 12 April at 0515 ZT, morning stars were observed, and the vessel's position was determined to be LAT 21°05'S, LONG 16°30'W. Your vessel is steaming...
  13. #77 On 29 July your 1930 zone time DR position is LONG 164°26.0' E. At that time you observe Polaris with a sextant altitude (hs) of 23°46.8'. The chronom...
  14. #80 On 17 July your 1951 zone time DR position is LAT 24°26.0' N, LONG 51°16.0' W. Considering their magnitude, azimuth, and altitude, which group include...
  15. #88 On 13 November your 1030 ZT DR position is LAT 19°03'S, LONG 6°34'E. You are on course 164°T, speed 12 knots. Determine your 1200 position using the f...
  16. #98 On 23 July your 1700 zone time DR position is LAT 27°29' N, LONG 129°26' W. You are on course 079°T at a speed of 20 knots. Considering their magnitud...
  17. #116 On 15 March in DR position LAT 21°42.0'N, LONG 55°26.0'W, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the si...
  18. #119 On 28 February your 1850 zone time DR position is LAT 27°49.0' N, LONG 159°24.0' W. Considering their magnitude, azimuth, and altitude, which group in...
  19. #120 On 8 November your 1731 zone time DR position is LAT 27°16.0' N, LONG 137°25.0' W. Considering their magnitude, azimuth, and altitude, which group inc...
  20. #124 Your 0745 ZT 15 July position is LAT 29°04.0'N, LONG 71°17.5'W. You are on course 165°T, and your speed is 8.0 knots. You observed 3 morning sun lines...
  21. #126 On 23 September while taking stars for an evening fix, an unidentified star is observed bearing 261°T at an observed altitude of 61°35'. Your 1836 zon...
  22. #127 On 22 February your 1857 ZT DR position is LAT 23°46.0' S, LONG 93°16.5' E. You observe an unidentified star bearing 159°T, at an observed altitude (H...
  23. #128 On 15 August your vessel is enroute from Bombay, India, to San Francisco, CA. You are steering course 020°T and making a speed of 20.0 knots. Your 183...
  24. #129 On 30 August in DR position LAT 26°34.0'N, LONG 141°36.0'W, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the...
  25. #133 On 25 March your 0500 ZT DR position is LAT 28°14.0' S, LONG 93°17.0' E. You are on course 291°T at a speed of 16.0 knots. You observed 3 celestial bo...
  26. #137 On 10 August your 0430 ZT position is LAT 29°56.7' S, LONG 139°11.0' E. Your course is 321°T, speed 18.2 knots. You observed 3 celestial bodies. Deter...
  27. #144 On 5 May your 1600 zone time DR position is LAT 17°28' S, LONG 143°39' E. You are on course 316°T at a speed of 17 knots. You observed 3 celestial bod...
  28. #164 On 27 March in DR position LAT 32°31.0'N, LONG 76°25.0'W, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the si...
  29. #175 At 0600 zone time, on 16 March your DR position is LAT 20°10.0'N, LONG 81°30.0'W. You are steering course 300°T. The speed over the ground is 10 knots...
  30. #178 On 18 May your 1030 ZT DR position is LAT 20°41'N, LONG 63°32'W. You are on course 106°T, speed 24 knots. Determine your 1200 position using the follo...
  31. #200 On 29 October in DR position LAT 41°12.0'N, LONG 50°18.9'W, you take an ex- meridian observation of the Sun's lower limb, near upper transit. The chro...
  32. #201 On 12 December your 1830 ZT DR position is LAT 24°16.0' S, LONG 41°18.0' W. You are on course 235°T at a speed of 16.0 knots. You observed 3 celestial...
  33. #202 On 25 August your 0300 zone time DR position is LAT 21°28.0' N, LONG 167°48.0' E. You are on course 248°T at a speed of 12 knots. You observed 3 celes...
  34. #207 At 0900 zone time on 23 September your DR position is LAT 28°48.0'N, LONG 153°11.5'W. You are steering course 257°T at a speed of 18.0 knots. You obse...
  35. #211 At 0450 zone time, on 25 June your DR position is LAT 21°26.0' N, LONG 160°24.5' W. You are steering course 100°T at a speed of 10 knots. You observed...
  36. #218 On 12 October your vessel is on course 081°T, speed 20 knots. Your 1800 zone time DR position is LAT 26°11.0' S, LONG 77°18.0' E. You observed 3 celes...
  37. #225 On 26 July your 1030 ZT DR position is LAT 18°25'N, LONG 51°15'W. You are on course 231°T, speed 15 knots. Determine your 1200 position using the foll...
  38. #232 On 9 November your 0400 DR position is LAT 18°24.0' S, LONG 97°36.0' W. You are on course 138°T at a speed of 16 knots. You observed 3 celestial bodie...
  39. #234 On 20 November your 1030 ZT DR position is LAT 27°16.0' N, LONG 157°18.6' E. You are on course 060°T at a speed of 20 knots. You observed 3 celestial...
  40. #235 On 23 August in DR position LAT 24°22.0'S, LONG 64°55.3'E, you take an ex- meridian observation of the Moon's upper limb at upper transit. The chronom...
  41. #236 On 10 March in DR position LAT 21°42.0'S, LONG 57°28.0'E, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the si...
  42. #237 On 22 August in DR position LAT 29°41.8'N, LONG 33°15.5'W, you take an ex- meridian observation of the Moon's upper limb at upper transit. The chronom...
  43. #239 On 30 July your 1030 ZT DR position is LAT 19°02'N, LONG 138°12'W. You are on course 309°T, speed 24 knots. Determine your 1200 position using the fol...
  44. #240 On 19 November in DR position LAT 20°03.5'N, LONG 129°48.0'W, you take an ex- meridian observation of the planet Venus at upper transit. The chronomet...
  45. #244 On 15 December in DR position LAT 23°24.0'N, LONG 55°36.0'W, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the...
  46. #246 On 30 December in DR position LAT 28°24.0'S, LONG 32°15.0'W, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the...
  47. #251 On 5 May in DR position LAT 38°34.5'N, LONG 124°20.7'W, you take an ex- meridian observation of the Sun's lower limb. The chronometer time of the sigh...
  48. #255 On 14 September your 1810 ZT DR position is LAT 27°12.0' S, LONG 71°10.0' E. You are on course 060°T at a speed of 15.0 knots. You observed 3 celestia...
  49. #266 On 25 May your vessel's 1858 zone time position is LAT 21°05.0'N, LONG 143°27.0'E. At that time a sextant observation of the planet Venus was made. Th...
  50. #267 On 11 February your 1832 zone time DR position is LONG 110°52.6' W. At that time you observe Polaris with a sextant altitude (hs) of 26°19.8'. The chr...
  51. #273 On 16 July at 2000 zone time, you take a sextant observation of Polaris. Your vessel's DR position is LAT 27°22.0' N, LONG 148°35.0' W, and your sexta...
  52. #277 On 22 August your 1852 zone time DR position is LONG 155°54.0' E. At that time you observe Polaris with a sextant altitude (hs) of 27°36.9'. The chron...
  53. #278 On 18 May your 1030 ZT DR position is LAT 18°30'N, LONG 62°31'W. You are on course 286°T, speed 24 knots. Determine your 1200 position using the follo...
  54. #279 On 15 November your 1030 ZT DR position is LAT 17°25'S, LONG 42°12'W. You are on course 059°T, speed 22 knots. Determine your 1200 position using the...
  55. #280 On 15 November your 1030 ZT DR position is LAT 19°41'S, LONG 41°37'W. You are on course 239°T, speed 22 knots. Determine your 1200 position using the...
  56. #281 On 30 July your 1030 ZT DR position is LAT 17°46'N, LONG 139°30'W. You are on course 129°T, speed 24 knots. Determine your 1200 position using the fol...
  57. #282 On 15 July your vessel is enroute from Portland, OR, to Singapore, Malaysia. You are steering course 243°T and making a speed of 16 knots. Your 1845 z...
  58. #283 At 1830 zone time, on 6 April your DR position is LAT 26°33.0' N, LONG 64°31.0' W. You are steering course 082°T at a speed of 16.0 knots. You observe...
  59. #284 On 25 October your 0430 ZT DR position is LAT 24°48' N, LONG 65°31' W. Your vessel is on course 030°T at a speed of 18 knots. You observed 3 celestial...
  60. #285 On 6 April your 1830 ZT DR position is LAT 26°33.0' N, LONG 64°31.0' W. You are on course 082°T at a speed of 16 knots. You observed 3 celestial bodie...
  61. #286 On 4 December your 1500 ZT DR position is LAT 18°06.0' N, LONG 75°42.0' W. You are on course 020°T at a speed of 15.0 knots. You observed 3 celestial...
  62. #287 On 24 October your 0100 DR position is LAT 27°42' N, LONG 158°35' E. You are on course 085°T at a speed of 12 knots. You observed 3 celestial bodies....
  63. #288 On 19 September your 0300 zone time DR position is LAT 24°35' N, LONG 88°40' W. You are on course 288°T at a speed of 14 knots. You observed 3 celesti...
  64. #289 On 19 November your 0200 zone time DR position is LAT 18°41' N, LONG 150°37' E. You are on course 014°T at a speed of 18 knots. You observed 3 celesti...
  65. #290 On 19 November your 0200 zone time DR position is LAT 20°29.0' N, LONG 150°21.3' E. You are on course 136°T at a speed of 18 knots. You observed 3 cel...
  66. #291 On 28 May your 0200 DR position is LAT 19°16.5' S , LONG 119°24.0' W. You are on course 107°T at a speed of 18 knots. You observed 3 celestial bodies....
  67. #292 On 16 April your 0200 zone time DR position is LAT 17°18' S, LONG 168°46' E. You are on course 236°T at a speed of 16 knots. You observed 3 celestial...
  68. #293 On 19 November your 0300 zone time DR position is LAT 19°23' N, LONG 151°37' E. You are on course 293°T at a speed of 17 knots. You observed 3 celesti...
  69. #294 At 0100 zone time on 23 September your DR position is LAT 24°25.0'N, LONG 83°00.0'W. You are steering course 315°T. The speed over the ground is 10.0...
  70. #318 On 4 June at 0630 ZT, morning stars were observed, and the vessel's position was determined to be LAT 26°15'S, LONG 121°20'W. Your vessel is steaming...
  71. #401 The speed of advance necessary to arrive in port at a designated time is 15.8 knots. The pitch of the propeller is 20.75 feet. You estimate 5% positiv...
  72. #403 You must average 16.25 knots to reach port at a designated time. Your propeller has a pitch of 21'08", and you estimate 4% negative slip. How many RPM...
  73. #411 You are turning 100 RPM, with propeller pitch of 25 feet, and an estimated negative slip of 5%. What is the speed of advance?
  74. #426 You are off the coast of Mexico and are taking a time tick for 1600. At approximately 1554, you hear the preparatory signal "VVVV de XDD" from the tim...
  75. #441 You are steering 318°psc. A northeasterly wind causes 3° of leeway. The variation is 14°E and the deviation table is extracted below. What will be the...
  76. #472 You are steering 125°pgc. The wind is southwest by south causing a 3° leeway. The variation is 6°E, the deviation is 2°W, and the gyro error is 1°W. W...
  77. #475 You are steering 142°pgc to make good your desired course. The gyro error is 1°E . The variation is 8°W. What should you steer by standard magnetic co...
  78. #478 You are heading 328°pgc to make good a course of 332°T, allowing 3° leeway for westerly winds and 1°E gyro error. The variation is 17°E. What should y...
  79. #484 At 1423 you are on course 072 T° at 12.2 knots, when you sight a rock awash bearing 070°T at a range of 3.6 miles. If you change course at 1427, what...
  80. #563 You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviati...
  81. #572 Your vessel is on a course of 144°T at 16 knots. At 0126 a light bears 166.5°T, and at 0152 the light bears 189°T. At what time and at what distance o...
  82. #582 Your vessel is on a course of 307°T at 20 knots. At 0914 a light bears 284.5°T, and at 0937 the light bears 262°T. At what time and at what distance o...
  83. #607 At 2048 ZT on 13 October you are in DR position LAT 44°02.8' S, LONG 146°58.3' E, when you observe an amplitude of Venus. The planet is about one Sun'...
  84. #612 At 1547 ZT on 22 May, in DR position LAT 45° 12.8' N, LONG 028° 15.4' W, the Moon's upper limb is observed on the visible horizon, bearing 120.0° psc....
  85. #613 At 2231 ZT on 14 July you are in DR position LAT 34°06' S, LONG 149°47' W, when you observe an amplitude of Jupiter. The planet is about one Sun's dia...
  86. #629 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 at what distance o...
  87. #650 Two beacons form a range in the direction of 221.5°T. The range is seen in line from your vessel bearing 223° per gyro compass. The variation in the a...
  88. #651 At 1337 ZT on July 17, in DR position LAT 30° 56.8' S, LONG 039° 36.5' W, you observe an amplitude of the Moon. The upper limb of the moon is on the v...
  89. #652 At 1538 ZT on 15 October, in DR position LAT 18° 12.8' S, LONG 160° 48.4' E, you observe an amplitude of the Moon. The center of the Moon is on the vi...
  90. #653 At 1430 ZT on 16 April, in DR position LAT 34° 03.8' N, LONG 061° 02.5'W, you observe an amplitude of the Moon. The center of the Moon is on the visib...
  91. #655 At 1610 ZT on 14 August, in DR position LAT 33° 24.6' S, LONG 028°15.4'W, you observe an amplitude of the Moon. The center of the Moon is on the visib...
  92. #659 At 1318 ZT on 10 September, in DR position LAT 24° 05.8' N, LONG 058° 08.3' E, you observe an amplitude of the Moon. The upper limb of the Moon is on...
  93. #660 At 1620 ZT on 10 September, in DR position LAT 34° 03.8' N, LONG 050° 28.4' W, you observe an amplitude of the Moon. The Moon's upper limb is observed...
  94. #662 Your vessel is on a course of 253°T at 18 knots. At 2027 a light bears 275.5°T, and at 2055 the light bears 298°T. At what time and at what distance o...
  95. #665 At 1435 ZT on 27 April, in DR position LAT 51° 56.8' N, LONG 150° 37.7' E, the Moon's upper limb is observed on the visible horizon, bearing 242.2° ps...
  96. #669 At 1502 ZT on 4 August, in DR position LAT 11° 21.6' S, LONG 088° 14.3' E, you observe an amplitude of the Moon. The upper limb of the Moon is on the...
  97. #672 At 2232 ZT on 14 July you are in DR position LAT 33°52' S, LONG 150°03' W, when you observe an amplitude of Jupiter. The planet is about one Sun's dia...
  98. #675 You are steering a course of 316°T, and a light bears 34° on the port bow at 2053. At 2126 the same light bears 68° on the port bow, and you have run...
  99. #683 At 2234 ZT on 14 July you are in DR position LAT 34°03' N, LONG 150°16' W, when you observe an amplitude of Saturn. The planet is about one Sun's diam...
  100. #684 At 2043 ZT on 13 October you are in DR position LAT 43°57.3' S, LONG 147°16.0' E, when you observe an amplitude of Venus. The planet is about one Sun'...

Navigation Problems questions: what to expect

Q How many Navigation Problems questions are in the Deck pool?

This retired set holds 121 Navigation Problems questions the Coast Guard no longer draws on exams. They stay online for reference; the current Navigation Problems module is the one to study.

Q What score do I need to pass the Navigation Problems module?

Most USCG exam modules, including Navigation Problems, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Navigation Problems 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.

Other Deck modules

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.