On 11 May in DR position LAT 37°06.0'N, LONG 45°45.0'W you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 089.0°psc. The chronometer reads 07h 57m 06s and is 01m 48s slow. Variation in the area is 20.0°W. What is the deviation?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 2.2°W
Solar amplitude sights correct chronometer time to obtain GMT, extract declination from the Nautical Almanac, solve for true bearing via latitude and declination, and compare it against standard compass and variation.
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