On 22 July your 0442 DR position is LAT 26°35.6' N, LONG 22°16.7' W. You observe an unidentified star bearing 149°T at an observed altitude (Ho) of 12°55.0'. The chronometer reads 05h 39m 03s, and is 03m 14s slow. What star did you observe?

Correct Answer: Option C — Acamar

Convert chronometer time to GMT, then determine GHA Aries and the star's SHA. Calculate LHA using the DR longitude. By comparing the calculated LHA and Declination against the Nautical Almanac star list, Acamar is identified as the body matching the observed altitude and bearing.