Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG General Navigation (Set 52)

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Question 1 of 30

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Question 1 of 30

A celestial body will cross the prime vertical circle when the latitude is numerically __________.

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30 MCQs

#1 A celestial body will cross the prime vertical circle when the latitude is numerically __________. #2 The great circle on the celestial sphere that passes through the zenith and the north and south poles is the __________. #3 You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________. #4 A chart position enclosed by a semi-circle is a(n) __________. #5 The prime vertical is the reference point from which the angle of which type of observation is measured? #6 When possible, a DR plot should always be started from where? #7 When applying a dip correction to the sighted sextant angle (hs), you always subtract the dip because you are correcting __________. #8 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)? #9 If an observer is at 35°N latitude, his zenith is __________. #10 Sidereal hour angle is always __________. #11 A time diagram is a diagram on the plane of the __________. #12 The change in the length of the day becomes greater as latitude increases because of the __________. #13 The test of a towing vessel's steering gear control system includes each item EXCEPT __________. #14 The angle that is measured westward from the first point of Aries to the hour circle of the body along the celestial equator is the __________. #15 The type of current which will have the greatest effect on the course made good for your vessel is __________. #16 The arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°, is the __________. #17 If you are the Master of a towing vessel whose only working radar no longer functions, what must you do? #18 The small circle of the celestial sphere parallel to the celestial equator, and transcribed by the daily motion of the body, is called the __________. #19 In the celestial equator system of coordinates what is the equivalent to the meridians of the Earth system of coordinates? #20 The zenith is the point on the celestial sphere that is __________. #21 If the right ascension of a body is 9 hours, it also __________. #22 The point on the celestial sphere that is directly over the observer is the __________. #23 In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system? #24 The nadir is the point on the celestial sphere that is __________. #25 Zenith distance is equal to __________. #26 Daylight savings time is a form of zone time that adopts the time __________. #27 90° - Ho = __________. #28 The measurement of local time is based on the passage of the Sun over the __________. #29 What is the equivalent of 83°29.6' in time units? #30 The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value?

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