On 2 October your 1845 DR position was LAT 28°09.2'S,... - USCG Navigation Problems

On 2 October your 1845 DR position was LAT 28°09.2'S, LONG 167°48.1'E. You observe a faint star through a hole in the clouds at a sextant altitude (hs) of 20°45.6' T, bearing 201.5°T. The index error is 1.3' off the arc, and the height of eye is 42 feet. The chronometer reads 07h 46m 19s and is 00m 51s fast. What star did you observe?

A Alpha Muscae

B Muhlifain

C Beta Corvi

D Cor Caroli

AI Explanation

The correct answer is A) Alpha Muscae. To determine the observed star, we need to calculate the celestial coordinates of the observed object and then compare it to the known positions of navigational stars. Given the provided information, we can calculate the observed object's altitude and azimuth. Using the celestial navigation formulas, the calculated altitude and azimuth match the characteristics of the star Alpha Muscae, which is the correct answer. The other options are incorrect because their celestial coordinates do not match the observed data.

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Official Resources

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

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