On 13 June your 0445 DR position is LAT 20°12.0' N, LONG 44°45.0' W. You observe an unidentified star bearing 168°T at an observed altitude (Ho) of 38°56.0'. The chronometer reads 07h 43m 20s, and is 01m 39s slow. Which star did you observe?
Official USCG Answer & Rule Citation
Correct Answer: Option A — Fomalhaut
Convert chronometer time to GMT, then find the GHA of Aries and the star's SHA. Calculate the LHA and determine the computed altitude and azimuth for the DR position. Matching the observed bearing of 168°T and altitude of 38°56.0' identifies the body as Fomalhaut using standard celestial navigation tables.
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