Question 66Navigation Problems

70% to pass

On 12 June your 1945 DR position is LAT 21°47.0'N, LONG 46°52.0'W when you observe a faint unidentifiable star through a break in the clouds. The star bears 130°T at a sextant altitude (hs) of 45°21.2'. The index error is 0.5' on the arc, and the height of eye is 45 feet. The chronometer reads 10h 43m 27s, and the chronometer error is 1m 46s slow. What star did you observe?

A Epsilon Leonis
B Beta Librae
C Theta Carinae
D Zeta Puppis
AI Explanation

The correct answer is B) Beta Librae. To determine the observed star, we can use the given information to calculate the star's celestial coordinates and then compare them to the coordinates of known stars. Using the provided position, time, sextant altitude, and other data, we can calculate the star's right ascension and declination. These celestial coordinates match the values for Beta Librae, confirming this as the observed star. The other answer choices do not have celestial coordinates that align with the provided information, making them incorrect for this scenario.

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