Question 37Navigation Problems

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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 162°T at a sextant altitude (hs) of 28°36.5'. 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 Mimosa
B Gamma Virginis
C Iota Centauri
D Spica
AI Explanation

The correct answer is C) Iota Centauri. To determine the observed star, we need to use the given information to calculate the star's celestial coordinates and then match them to the star catalog. Based on the provided data, the calculated celestial coordinates point to Iota Centauri as the observed star. The observed star's calculated altitude and azimuth match the characteristics of Iota Centauri, while the other answer choices do not fit the observed data. The other options are incorrect because their celestial coordinates do not match the calculated values from the observation details provided in the question.

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