Deck Misc (Supplementary) USCG Question #653 (Set 4)

At 1430 ZT on 16 April, in DR position LAT 34° 03.8' N, LONG 061° 02.5'W, you observe an amplitude of the Moon. The center of the Moon is on the visible horizon and bears 095.2°psc. The variation is 12°W. What is the deviation?

Official USCG Answer & Rule Citation

Correct Answer: Option B — 1.9°E

Celestial amplitude solutions depend on accurate DR latitude and tabulated declination. Find true amplitude, adjust for variation to obtain magnetic, and determine compass deviation by direct comparison.

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