Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG General Navigation (Set 53)
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Question 1 of 30
In working out a local apparent noon sight for your latitude, you subtract the Ho from 90°. The 90° represents the angular distance from __________.
Browse Questions in Set 53
30 MCQs #1 In working out a local apparent noon sight for your latitude, you subtract the Ho from 90°. The 90° represents the angular distance from __________. #2 If the Sun's observed altitude is 54°30', what is the zenith distance? #3 If the Sun's observed altitude is 27°12', the zenith distance is __________. #4 In the horizon system of coordinates what is equivalent to latitude on the Earth? #5 In the horizon system of coordinates what is equivalent to the declination of the equator system? #6 In the horizon system of coordinates what is equivalent to the local hour angle of the celestial equator system? #7 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? #8 Right ascension is primarily used by the navigator for __________. #9 The maximum difference between mean time and apparent time is __________. #10 The angle measured from the observer's meridian, clockwise or counterclockwise up to 180°, to the vertical circle of the body is the __________. #11 When the time is based on the movement of the visible Sun along the ecliptic the time is known as __________. #12 The GMT is 0445 and your zone description is +1. Your zone time is __________. #13 The celestial coordinate of a star that is relatively constant in value is the __________. #14 The GHA of a star __________. #15 The ecliptic is __________. #16 The navigator is concerned with three systems of coordinates. Which system is not of major concern? #17 What is NOT a side of the navigational triangle used in sight reduction? #18 17 degrees of latitude is equal to __________. #19 You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse? #20 A line on the Earth parallel to the equator is a __________. #21 Sidereal time is used by navigators when __________. #22 A parallel of latitude other than the equator is a __________. #23 The distance between any two meridians measured along a parallel of latitude __________. #24 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)? #25 During one synodic rotation, a body makes one complete turn relative to the __________. #26 Which is NOT a side of the celestial navigational triangle? #27 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? #28 A vertex of the navigational triangle is NOT located at the __________. #29 A towing vessel is NOT required to be fitted with radar if it is __________. #30 What great circle is always needed to form the astronomical triangle?
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