Navigation Problems USCG Question #99 (Set 3)

On 22 July your 1759 ZT DR position is LAT 24°50.2' S, LONG 05°16.0' E. You observe an unidentified star bearing 231°T, at an observed altitude (Ho) of 26°10.0'. The chronometer reads 06h 01m 31s and is 02m 15s fast. What star did you observe?

Official USCG Answer & Rule Citation

Correct Answer: Option C — Suhail

Convert chronometer time to GMT, then find GHA Aries and the star's SHA. Determine LHA using the DR longitude. By matching the calculated LHA and Declination with the Nautical Almanac star list, Suhail is identified as the celestial body corresponding to the observed bearing and altitude.

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