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Deck · 2,005 questions

Navigation Problems - USCG Exam Questions

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.

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All Navigation Problems questions

Questions 501–600 of 2,005 · page 6 of 21

  1. #590 On 9 May your vessel's 1809 ZT DR position is LAT 48°13.7'N, LONG 168°36.3'E, when an amplitude of the Sun is observed. The Sun's center is on the cel...
  2. #591 On 11 May your vessel's 1839 ZT position is LAT 17°30'N, LONG 63°55'W, when an amplitude of the Sun's center is observed on the celestial horizon bear...
  3. #592 On 17 April your vessel's position is LAT 21°00'S, LONG 78°30'W, when an amplitude of the Sun is observed. The Sun's center is on the celestial horizo...
  4. #593 On 8 December in DR position LAT 21°56.1'S, LONG 17°21.6'E you observe an amplitude of the Sun. The Sun's center is on the celestial horizon and bears...
  5. #594 At your current speed of 19 knots you only have enough fuel remaining to travel 265 miles. You must travel 731 miles to reach your destination. What s...
  6. #595 Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this...
  7. #596 You are planning a voyage between Portland, LAT 46°05'N, LONG 124°00'W, and Korea via LAT 44°00'N, LONG 155°00'E. Which statement is TRUE? (Use gnomon...
  8. #597 While steaming at 16.3 knots, your vessel consumes 363 barrels of fuel oil per day. In order to reduce consumption to 298 barrels of fuel oil per day,...
  9. #598 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...
  10. #600 On 30 July, your 0200 zone time (ZD +4) DR position is LAT 43°48'N, LONG 78°00 W. At that time, you observe Polaris bearing 008.7°psc. The chronometer...
  11. #601 While steaming at 14.5 knots, your vessel consumes 242 barrels of fuel oil per day. In order to reduce consumption to 152 barrels of fuel oil per day,...
  12. #602 Your vessel receives a distress call from a vessel reporting her position as LAT 35°01.0'S, LONG 18°51.0'W. Your position is LAT 35°01.0'S, LONG 21°42...
  13. #603 You depart LAT 40°42.0'N, LONG 74°01.0'W, and steam 3365.6 miles on course 118°T. What is the longitude of your arrival by Mercator sailing?
  14. #604 You depart LAT 25°54'N, LONG 9°38'E and steam 592 miles on course 270°. What is the longitude of arrival?
  15. #605 On 6 August your 1552 zone time DR position is LAT 24°26.0'S, LONG 73°19.0'E. At that time, you observe the Sun bearing 302°psc. The chronometer reads...
  16. #606 At 1210 zone time on 1 December, you depart Seattle, LAT 47°36.0'N, LONG 122°22.0'W (ZD +8). You are bound for Guam, LAT 13°27.0'N, LONG 144°37.0'E, a...
  17. #608 On 24 August in DR position LAT 26°49.4'N, LONG 146°19.4'E, you observe an amplitude of the Sun. The Sun's center is on the celestial horizon and bear...
  18. #609 You are planning a voyage by great circle from LAT 38°00'N, LONG 73°00'W to LAT 49°00'N, LONG 06°00'W. Which of the following statements is TRUE? (Use...
  19. #610 On 13 October your vessel's 1722 zone time DR position is LAT 27°36'S, LONG 136°16'E, when an amplitude of the Sun is observed. The Sun's center is on...
  20. #611 You wish to check the deviation of your standard magnetic compass. You find a natural range that you steer for and note that the gyrocompass heading i...
  21. #614 While steaming at 19.4 knots, your vessel consumes 392 barrels of fuel oil per day. In order to reduce consumption to 182 barrels of fuel oil per day,...
  22. #615 You have steamed 432 miles at 18 knots and burning 406 barrels of fuel per day. You must decrease your consumption to 221 barrels per day with 190 mil...
  23. #616 On 23 August at 0604 ZT, in DR position LAT 16°42.3'S, LONG 28°19.3'W, you observed an amplitude of the Sun. The lower limb was a little above the hor...
  24. #617 On 19 June your vessel's 0523 ZT DR position is LAT 25°12.0'N, LONG 123°14.0'W, when an amplitude of the Sun is observed. The Sun's center is on the v...
  25. #618 On 11 July your 0240 ZT position is LAT 14°52'N, LONG 34°23'W. You observe Polaris bearing 359.8°pgc. At the time of the observation the helmsman note...
  26. #619 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...
  27. #620 You are planning a voyage by great circle to Reykjavik, Iceland, via Cape Race, Newfoundland, LAT 46°30'N, LONG 53°00'W. Which statement is TRUE? (Use...
  28. #621 On September 9 your 2130 zone time (ZD +5) DR position is LAT 45°08'N, LONG 82°38'W. At that time, you observe Polaris bearing 000.5°pgc. The chronome...
  29. #622 On 23 August in DR position LAT 24°07.0'N, LONG 136°16.0'E, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears...
  30. #624 Your vessel is proceeding up a channel steering on a pair of range lights that are in line ahead. The chart indicates that the direction of this pair...
  31. #625 You have steamed 217 miles and consumed 23.0 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 362 m...
  32. #626 On 9 September your 2043 ZT position is LAT 24°18'N, LONG 66°46'W. You observe Polaris bearing 001°pgc. At the time of the observation the helmsman no...
  33. #627 The great circle distance from LAT 25°50'N, LONG 77°00'W to LAT 35°56'N, LONG 06°15'W is 3616 miles, and the initial course is 061.7°T. Determine the...
  34. #628 On 15 July in DR position LAT 22°19.0'N, LONG 154°37.0'W, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 29...
  35. #630 While on a course of 097°pgc, a light bears 8° on the port bow at a distance of 11.7 miles. What course should you steer to pass 3 miles abeam of the...
  36. #631 On 23 October in DR position LAT 21°13.0'N, LONG 152°18.0'E, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears...
  37. #632 The great circle distance from LAT 25°50'N, LONG 77°00'W to LAT 35°56'N, LONG 06°15'W is 3616 miles, and the initial course is 061.7°T. Determine the...
  38. #633 On 16 April in DR position LAT 28°07.0'N, LONG 81°47.0'W, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 07...
  39. #634 On 28 September in DR position LAT 24°12.0'S, LONG 85°25.0'E, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bear...
  40. #635 You have steamed 504 miles at 21 knots and burning 633 barrels of fuel per day. You must decrease your consumption to 410 barrels per day with 399 mil...
  41. #636 On 11 May in DR position LAT 37°06.0'N, LONG 45°45.0'W you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 089.0...
  42. #637 While entering a harbor on a course of 225° per gyrocompass, you take a bearing on a pair of range lights and get 220° per gyrocompass. The bearing on...
  43. #638 A vessel steams 580 miles on course 083°T from LAT 13°12'N, LONG 71°12'W. What are the latitude and longitude of the point of arrival by mid-latitude...
  44. #639 While on a course of 349°T, a light bears 13° on your starboard bow at a distance of 10.8 miles. What course should you steer to pass 2.5 miles abeam...
  45. #640 On 4 July your vessel's 1722 zone time DR position is LAT 34°30'S, LONG 174°48'E, when an amplitude of the Sun is observed. The sun's center is on the...
  46. #641 In planning a North Pacific voyage, you wish to steam the minimum distance from LAT 48°30'N, LONG 124°45'W to LAT 44°00'N, LONG 150°00'E, while remain...
  47. #642 On 28 November your vessel's 0652 DR position is LAT 37°30'N, LONG 124°12'W, when an amplitude of the Sun is observed. The Sun's center is on the visi...
  48. #643 You depart LAT 51°48.0'S, LONG 178°35.0'W and steam 179 miles on course 270°. What is the longitude of arrival?
  49. #644 On 10 June your vessel's 0519 zone time DR position is LAT 27°07.0'N, LONG 92°10.0'W, when an amplitude of the Sun is observed. The Sun's center is on...
  50. #645 Determine the great circle distance and initial course from LAT 34°51.0'N, LONG 115°01.2'E to LAT 10°16.0'S, LONG 51°42.6'E.
  51. #646 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...
  52. #647 While on a course of 192°T, a light bears 11° on the starboard bow at a distance of 12.7 miles. What course should you steer to pass 3 miles abeam of...
  53. #648 A vessel at LAT 33°45'N, LONG 118°30'W, heads for a destination at LAT 21°15'N, LONG 157°36'W. Determine the true course and distance by Mercator sail...
  54. #649 Your vessel is on a course of 079°T at 11 knots. At 0152 a light bears 105.5°T, and at 0209 the light bears 124°T. At what time and at what distance o...
  55. #654 Your vessel receives a distress call from a vessel reporting her position at LAT 5°24'N, LONG 31°16'W. Your position is LAT 2°39'S, LONG 39°24'W. Dete...
  56. #656 At 1542 ZT on 23 October, in DR position LAT 37° 28.5'N, LONG 156° 17.3'E, you observe an amplitude of the Moon. The center of the Moon is on the visi...
  57. #657 A vessel at LAT 29°38.0'N, LONG 93°49.0'W, heads for a destination at LAT 24°38.0'N, LONG 82°55.2'W. Determine the true course and distance by Mercato...
  58. #658 On 2 March your 2216 ZT DR position is LAT 21°20.0'S, LONG 17°10.0'W. At that time, you observe Saturn bearing 078°psc. The chronometer reads 11h 14m...
  59. #661 You are steaming at 22 knots and burning 319 barrels of fuel per day. You must decrease your consumption to 137 barrels per day. What must you reduce...
  60. #663 At 1444 ZT on 28 July, in DR position LAT 40° 56.8' N, LONG 167° 12.4' E, you observe an amplitude of the Moon. The upper limb of the Moon is on the v...
  61. #664 Determine the great circle distance and initial course from LAT 27°51.0'N, LONG 71°41.0'W to LAT 49°45.0'N, LONG 06°14.0'W.
  62. #666 At 1523 ZT on 14 June, in DR position LAT 31°58'S, LONG 48°42'W you observe an amplitude of the Moon. The center of the Moon is on the visible horizon...
  63. #667 At 1524 ZT on 14 June, in DR position LAT 30°51'N, LONG 30° 02'W, you observe an amplitude of the Moon. The center of the Moon is on the visible horiz...
  64. #668 At 1622 ZT on 15 June, in DR position LAT 10° 15.2' N, LONG 135° 10' W, you observe an amplitude of the Moon. The center of the Moon is on the visible...
  65. #670 Your vessel is proceeding down a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of th...
  66. #671 A vessel steams 720 miles on course 058°T from LAT 30°06.0'S, LONG 31°42.0'E. What are the latitude and longitude of the point of arrival by mid-latit...
  67. #673 You are on course 251°pgc and 241° per magnetic compass, when you observe a range in line bearing 192°pgc. The chart indicates that the range is in li...
  68. #674 On 5 February your 2320 ZT position is LAT 52°28'N, LONG 23°48'W. You observe Polaris bearing 000.2°pgc. At the time of the observation the helmsman n...
  69. #676 At 0915 zone time on 7 November you depart Seattle, LAT 47°36.0'N, LONG 122°22.0'W, (ZD +8). You are bound for Kobe, LAT 34°40.0'N, LONG 135°12.0'E, a...
  70. #677 On 16 September your vessel's 0736 zone time DR position is LAT 27°34'S, LONG 174°49'E, when an azimuth of the Sun is observed. The chronometer time o...
  71. #678 At 2326 ZT on 22 June, your vessel's position is LAT 28°30'N, LONG 150°04'W. An azimuth of the planet Jupiter is observed, and the standard compass be...
  72. #679 Your vessel consumes 268 barrels of fuel per day at a speed of 19.0 knots. What will be the fuel consumption of your vessel at 15.0 knots?
  73. #680 You are on a voyage from Limoy, Costa Rica to Los Angeles, CA. The distance from departure to arrival is 3150 miles. The speed of advance is 14.0 knot...
  74. #681 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...
  75. #682 You have steamed 1587 miles at 11.2 knots, and have consumed one-half of your total fuel capacity of 2840 bbls. What is the maximum speed you can stea...
  76. #685 On 6 November your 0752 zone time DR position is LAT 25°11.0'N, LONG 76°07.0'W. At that time, you observe the Sun bearing 119°psc. The chronometer rea...
  77. #686 On 4 October, your 0734 zone time DR position is LAT 24°11.0'N, LONG 162°34.0'E. At that time, you observe the Sun bearing 105.5°psc. The chronometer...
  78. #687 On a North Pacific voyage, you wish to sail the shortest distance from LAT 46°05'N, LONG 124°00'W to LAT 44°00'N, LONG 150°00'E. You do not want to ex...
  79. #688 On which voyage would a great circle track be significantly shorter than a rhumb line track? (Use gnomonic tracking chart WOXZC 5274)
  80. #689 On 17 April your 1516 zone time DR position is LAT 27°24.0'N, LONG 115°24.0'E. At that time, you observe the Sun bearing 247°psc. The chronometer read...
  81. #690 You are steaming at 22 knots and burning 319 barrels of fuel per day. You must decrease your consumption to 137 barrels per day. What must you reduce...
  82. #691 You have steamed 918 miles at 15.0 knots, and consumed 183 tons of fuel. If you have 200 tons of usable fuel remaining, how far can you steam at 12 kn...
  83. #692 On 21 February your 0823 zone time DR position is LAT 21°44.0'S, LONG 80°14.0'E. At that time, you observe the Sun bearing 096°psc. The chronometer re...
  84. #693 You depart LAT 37°36'N, LONG 123°00'W, and steam 2022 miles on course 241°T. What is the longitude of your arrival by Mercator sailing?
  85. #694 On 9 February your 0739 zone time DR position is LAT 23°31.0'N, LONG 143°41.0'E. At that time, you observe the Sun bearing 104.5°psc. The chronometer...
  86. #695 On 26 May your 0723 zone time DR position is LAT 24°50.0'N, LONG 38°11.0'W. At that time, you observe the Sun bearing 076.5°psc. The chronometer reads...
  87. #696 At 0820 zone time on 10 April you depart Yokohama, LAT 35°27.0'N, LONG 139°39.0'E (ZD -9). You are bound for Honolulu, LAT 21°18.5'N, LONG 157°52.2'W...
  88. #697 On 26 January your 1615 ZT DR position is LAT 27°14.0'S, LONG 57°22.0'W. At that time, you observe the Sun bearing 266°psc. The chronometer reads 08h...
  89. #698 On 14 January your 0746 zone time DR position is LAT 26°37.0'N, LONG 153°19.0'W. At that time, you observe the Sun bearing 123°psc. The chronometer re...
  90. #699 A vessel steams 1650 miles on course 077°T from LAT 12°47'N, LONG 45°10'E. What is the latitude and longitude of the point of arrival by Mercator sail...
  91. #700 A vessel steams 1082 miles on course 047°T from LAT 37°18.0'N, LONG 24°40.0'W. What is the latitude and longitude of the point of arrival by Mercator...
  92. #702 While steaming at 15 knots, your vessel burns 326 bbls of fuel per day. What will be the rate of fuel consumption if you decrease speed to 12.2 knots?
  93. #703 A vessel at LAT 11°22'S, LONG 009°18'E heads for a destination at LAT 06°52'N, LONG 57°23'W. Determine the true course and distance by Mercator sailin...
  94. #704 A vessel at LAT 45°36.0'N, LONG 11°36.0'W, heads for a destination at LAT 24°16.0'N, LONG 73°52.0'W. Determine the true course and distance by Mercato...
  95. #705 A vessel at LAT 49°45'N, LONG 6°35'W, heads for a destination at LAT 25°50'N, LONG 77°00'W. Determine the true course and distance by Mercator sailing...
  96. #706 On 27 June your vessel's 0816 ZT DR position is LAT 22°14'S, LONG 53°52'W, when an azimuth of the Sun is observed. The chronometer time of the sight i...
  97. #707 On 12 June at 0919 zone time, your position is LAT 26°52'N, LONG 84°34'W. The chronometer reads 03h 17m 00s. Chronometer error is 01m 40s slow. At tha...
  98. #708 You depart LAT 38°12'S, LONG 12°06'W and steam 1543 miles on course 270°. What is the Longitude of arrival?
  99. #709 The great circle distance from LAT 38°17.0'N, LONG 123°16.0'W to LAT 35°01.0'N, LONG 142°21.0'E is 4330 miles and the initial course is 300.9°T. The l...
  100. #710 The great circle distance from LAT 24°25.3'N, LONG 83°02.6'W to LAT 35°57.2'N, LONG 5°45.7'W is 3966.5 miles. Determine the latitude of the vertex.

Navigation Problems questions: what to expect

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

There are 2,005 Navigation Problems 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 Navigation Problems module from the same pool.

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.

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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.