Question 118Navigation Problems

70% to pass

On 12 June your 1845 DR position is LAT 21°47'N, LONG 46°52'W when you observe a faint unidentifiable star through a break in the clouds. The star bears 019.0°T at a sextant altitude (hs) of 53°56.2'. The index error is 0.5' on the arc, and the height of eye is 45 feet. The chronometer reads 09h 43m 27s, and the chronometer error is 1m 46s slow. What star did you observe?

A Mizar
B Mimosa
C Gamma Ursae Minoris
D Phecda
AI Explanation

The correct answer is A) Mizar. To determine the observed star, we need to use the given information to calculate the celestial coordinates of the observed star and compare them to the coordinates of known stars. Using the provided position, time, sextant altitude, and other details, we can calculate the observed star's altitude and azimuth. These celestial coordinates match the characteristics of the star Mizar, which is the correct answer. The other answer choices (Mimosa, Gamma Ursae Minoris, and Phecda) do not have celestial coordinates that align with the observed star based on the given information, and therefore are incorrect.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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