At 1502 ZT on 4 August, in DR position LAT 11° 21.6' S, LONG 088° 14.3' E, you observe an amplitude of the Moon. The upper limb of the Moon is on the visible horizon and bears 289° psc. The variation is 15° W. What is the deviation?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 1.1°W
Celestial amplitude techniques equate true bearing with latitude and celestial body declination. Adjusting for variation isolates magnetic heading to find exact compass deviation.
100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.