At 1620 ZT on 10 September, in DR position LAT 34° 03.8' N, LONG 050° 28.4' W, you observe an amplitude of the Moon. The Moon's upper limb is observed on the visible horizon and bears 110.2° psc. The variation is 2° E. What is the deviation?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 1.2°E
Celestial navigation amplitude formulas convert declination and latitude into true bearing. By applying local variation and comparing to the compass reading, deviation is accurately derived.
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