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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 1,601–1,700 of 2,005 · page 17 of 21

  1. #1812 While on a course of 321°T, a light bears 7° on the starboard bow at a distance of 9.7 miles. What course should you steer to pass 3.5 miles a...
  2. #1813 While on a course of 283°pgc, a light bears 10° on the port bow at a distance of 8.3 miles. What course should you steer to pass 3.5 miles abe...
  3. #1814 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 mile...
  4. #1815 You are steering 349°T, and a light is picked up dead ahead at a distance of 17.2 miles at 2122. You change course to pass the light 4.5 miles off...
  5. #1816 You are on course 006°T, speed 16.6 knots. At 0516 you see a light bearing 008°T at a range of 10.2. If you change course at 0528 to leave the...
  6. #1817 You are steering 019°T, and a light is picked up dead ahead at a distance of 11.6 miles at 0216. You change course to pass the light 3 miles off a...
  7. #1818 You are steering 231°T, and a light is picked up dead ahead at a distance of 12.3 miles at 0338. You change course to pass the light 4 miles off a...
  8. #1819 You are steering 143°T, and a light is picked up dead ahead at a distance of 18.2 miles at 2006. You change course to pass the light 5.5 miles off...
  9. #1820 You are on course 086°T, speed 11.7 knots. At 1013 you see a buoy bearing 088°T at a range of 4.8 miles. If you change course at 1019 to leave...
  10. #1821 You are steering 246°T, and a light is picked up dead ahead at a distance of 14 miles at 1037. You change course to pass the light 2.5 miles off a...
  11. #1822 You are on course 035°T, speed 18.3 knots. At 0719 you see a buoy bearing 036°T at a range of 4.1. If you change course at 0725 to leave the b...
  12. #1823 You are steering 115°T, and a light is picked up dead ahead at a distance of 16.7 miles at 0522. You change course to pass the light 3.5 miles off...
  13. #1824 You are steering 173°T, and a light is picked up dead ahead at a distance of 13.9 miles at 0054. You change course to pass the light 4.5 miles off...
  14. #1825 Your vessel is on a course of 255°T, at 14 knots. At 2126 a lighthouse is sighted dead ahead at a distance of 11 miles. You change course at this...
  15. #1826 You are steering 163°T, and a light is picked up dead ahead at a distance of 11 miles at 0142. You change course to pass the light 2 miles off abe...
  16. #1827 You are steering 031°T, and a light is picked up dead ahead at a distance of 12.7 miles at 0017. You change course to pass the light 3.5 miles off...
  17. #1828 Your vessel is on a course of 297°T at 11 knots. At 0019 a light bears 274.5°T and at 0048 the light bears 252°T. At what time and at what...
  18. #1829 You are steering 257°T, and a light is picked up dead ahead at a distance of 13.3 miles at 2016. You change course to pass the light 4 miles off a...
  19. #1830 You are steering 202°T, and a light is picked up dead ahead at a distance of 14.6 miles at 2234. You change course to pass the light 5 miles off a...
  20. #1831 You are steering 107°T, and a light is picked up dead ahead at a distance of 11 miles at 0847. You change course to leave the light 3 miles off to...
  21. #1832 You are steering 287°T, and a light is picked up dead ahead at a distance of 19.4 miles at 0419. You change course to pass the light 4 miles off a...
  22. #1833 You are steering 078°T, and a light is picked up dead ahead at a distance of 15.6 miles at 2316. You change course to pass the light 4.5 miles off...
  23. #1835 The wind at Frying Pan shoals has been south-southwesterly at an average velocity of 30 mph. The predicted set and drift of the rotary current are 232...
  24. #1836 The wind in the vicinity of Nantucket Shoals Light has been southerly at an average speed of 23 mph. The predicted set and drift of the rotary current...
  25. #1837 The wind at Frying Pan shoals has been west-northwesterly at an average velocity of 40 mph. The predicted set and drift of the rotary current are 323&...
  26. #1838 The wind at Frying Pan shoals has been north-northeasterly at an average velocity of 30 mph. The predicted set and drift of the rotary current are 355...
  27. #1839 The wind at Frying Pan shoals has been northwesterly at an average velocity of 22 mph. The predicted set and drift of the rotary current are 125°...
  28. #1840 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 t...
  29. #1841 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 a...
  30. #1842 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...
  31. #1843 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...
  32. #1844 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...
  33. #1845 You are turning 90 RPM, with a propeller pitch of 24 feet, and an estimated slip of -3%. What is the speed of advance?
  34. #1846 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...
  35. #1847 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'....
  36. #1848 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 revol...
  37. #1849 You are turning 100 RPM, with a propeller pitch of 25 feet, and an estimated slip of -5%. What is the speed of advance?
  38. #1850 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 thei...
  39. #1851 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'. Th...
  40. #1852 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 rev...
  41. #1853 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...
  42. #1854 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 gr...
  43. #1855 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 i...
  44. #1856 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 gro...
  45. #1857 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...
  46. #1858 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...
  47. #1859 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...
  48. #1860 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...
  49. #1861 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...
  50. #1862 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...
  51. #1863 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 ch...
  52. #1864 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 ch...
  53. #1865 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...
  54. #1866 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. T...
  55. #1867 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...
  56. #1868 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...
  57. #1869 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...
  58. #1870 On 26 May your vessel's 1906 zone time position is LAT 27°16.0'N, LONG 24°37.0'W. At that time, a sextant observation of the planet Jupiter wa...
  59. #1871 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 s...
  60. #1872 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...
  61. #1873 On 13 August your 0345 ZT DR position is LAT 21°35.0'N, LONG 135°26.0'W. You are on course 052°T at a speed of 14 knots. What will be the...
  62. #1874 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...
  63. #1875 You are turning 78 RPM, with a propeller pitch of 21 feet, and an estimated slip of -7%. What is the speed of advance?
  64. #1876 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...
  65. #1877 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...
  66. #1878 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 th...
  67. #1879 On 25 August your 1926 zone time DR position is LAT 24°17.0'S, LONG 05°47.0'W. At that time, you observe Fomalhaut bearing 117°psc. The ch...
  68. #1880 Your vessel departs Yokohama from position LAT 35°27.0'N, LONG 139°39.0'E (ZD -9), at 1330 ZT on 23 July, bound for Seattle at position LAT 47...
  69. #1881 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 distan...
  70. #1882 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 o...
  71. #1883 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...
  72. #1884 At 2237 ZT on 14 July you are in DR position LAT 33°57'N, LONG 150°32'W, when you observe an amplitude of Saturn. The planet is about one Sun'...
  73. #1885 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 distan...
  74. #1886 On 16 June your 0430 zone time DR position is LAT 29°24.0'S, LONG 36°16.0'E. At that time, you observe Vega bearing 341.0°psc. The chronom...
  75. #1887 On 1 March your 2135 zone time DR position is LAT 23°54.0'N, LONG 63°22.0'W. At that time, you observe Schedar bearing 328°psc. The chrono...
  76. #1888 You are on course 317°T at 13 knots. A light is bearing 22.5° relative at 0640. At 0659 the same light is bearing 45° relative. At what ti...
  77. #1889 On 4 October your 1907 zone time DR position is LAT 25°15.0'S, LONG 105°44.0'E. At that time, you observe Deneb bearing 011.5°psc. The chr...
  78. #1890 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...
  79. #1891 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...
  80. #1892 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...
  81. #1893 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 th...
  82. #1894 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...
  83. #1895 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 ob...
  84. #1896 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...
  85. #1897 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...
  86. #1898 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'...
  87. #1899 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 on...
  88. #1900 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 on...
  89. #1901 On 15 October your 0325 zone time DR position is LAT 26°51.0'N, LONG 138°17.0'W. At that time, you observe Canopus bearing 167°pgc. The ch...
  90. #1902 On 5 June your 0420 zone time DR position is LAT 26°47.0'N, LONG 133°19.5'W. At that time, you observe Vega bearing 298.1°psc. The chronom...
  91. #1903 On 28 July your 1937 zone time DR position is LAT 26°13.0'N, LONG 78°27.0'E. At that time, you observe Deneb bearing 048.7°pgc. The chrono...
  92. #1904 On 22 April your 0344 zone time DR position is LAT 21°16.0'N, LONG 107°32.0'W. At that time, you observe Spica bearing 236°psc. The chrono...
  93. #1905 Two beacons form a range in the direction of 221.5°T. The range is seen in line from your vessel bearing 223° per gyrocompass. The variation i...
  94. #1906 At 0915 ZT on 26 July you depart Yokohama, LAT 35°27.0'N, LONG 139°39.0'E (ZD -9). You are bound for Seattle, LAT 47°36.0'N, LONG 122°...
  95. #1907 A vessel at LAT 20°00'N, LONG 107°30'W is to proceed to LAT 24°40'N, LONG 112°30'W. What is the course and distance by mid-latitude sa...
  96. #1908 Your vessel is on a course of 129°T at 13 knots. At 1937 a light bears 151.5°T. At 2003 the light bears 174°T. At what time and distance o...
  97. #1909 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 distan...
  98. #1910 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 distan...
  99. #1911 Your vessel is on a course of 082°T at 19 knots. At 0255 a light bears 059.5°T, and at 0312 the light bears 037°T. At what time and distan...
  100. #1912 Your vessel is on a course of 343°T at 14 knots. At 2156 a light bears 320.5°T, and at 2217 the light bears 298°T. At what time and distan...

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.