On 17 March your 0520 DR position is LAT 27°23.0'N, LONG 39°42.0'W. At this time you observe an unidentified star bearing 270°T with an observed altitude of 46°30.2'. The chronometer reads 08h 22m 15s, and is 01m 45s fast. What star did you observe?

Correct Answer: Option C — Arcturus

Convert chronometer time to GMT, then find GHA Aries and the star's SHA. Calculate LHA and Declination. By solving the navigational triangle for the observed altitude and bearing, the resulting coordinates align with Arcturus. Bowditch principles dictate that the intersection of the circle of position identifies the star.