Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Navigation (Set 68)
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90° - Ho = __________.
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30 MCQs #1 90° - Ho = __________. #2 If the Sun's observed altitude is 54°30', what is the zenith distance? #3 Your longitude is 179°59'W. The LMT at this longitude is 23h 56m on the 4th day of the month. Six minutes later, your position is 179°59'E longitude. Your LMT and date are __________. #4 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? #5 15° of latitude is equal to __________. #6 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 the observation? #7 A ship is in longitude 54°00'W on a true course of 270°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time? #8 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 height of eye is 42 feet. The index error is 1.9' off the arc. What is the observed altitude (Ho)? #9 What is the equivalent of 0°48' in time units? #10 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 arc. The temperature is 19°F and the barometer reads 1030.8 millibars. What is the observed altitude (Ho)? #11 In the Bay of Fundy, during twilight, you a take sight of Mars. The sextant altitude (hs) is 03°35.5'. Your height of eye is 32 feet and there is no index error. The air temperature is -10°C and the barometer reads 1010 millibars. What is the observed altitude (Ho)? #12 The angle measured from the observer's meridian, clockwise or counterclockwise up to 180°, to the vertical circle of the body is the __________. #13 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 apparent Sun cross your meridian? #14 What is the equivalent of 83°29.6' in time units? #15 What is the equivalent of 1°53' in time units? #16 What is the equivalent of 2°52' in time units? #17 What is the equivalent of 5°54' in time units? #18 What is the equivalent of 10°48' in time units? #19 If the GMT is 1500, the time at 75°E longitude is __________. #20 You are in LONG 144°E. The date is 6 February, and the zone time is 0800. The Greenwich date and time are __________. #21 A ship is in longitude 54°00'W on a true course of 090°. The ship's clocks are on the proper time zone. At what longitude should the clocks be changed to maintain the proper zone time? #22 It is 1200 local time for an observer at 54°E longitude. Which statement is TRUE? #23 You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse? #24 What is the geographic longitude of a body whose GHA is 232°27'? #25 What is the geographic longitude of a body whose GHA is 215°15'? #26 A position on the Earth has a longitude of 74°10'E. Its celestial counterpart would have a __________. #27 At 0000 you fix your position and change course to 090°T. At 0030 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE? #28 At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE? #29 You take a bearing of 264° of a lighthouse. What bearing of another object would give the best fix? #30 You take a bearing of 176° of a lighthouse. What bearing of another object would give the best fix?
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