At 1538 ZT on 15 October, in DR position LAT 18° 12.8' S, LONG 160° 48.4' E, you observe an amplitude of the Moon. The center of the Moon is on the visible horizon and bears 276.2°psc. Variation is 10° E. What is the deviation?

Correct Answer: Option B — 3.6°W

Calculate true amplitude using latitude and the Moon's declination from the Nautical Almanac. Convert true to magnetic via variation, then compare with the standard compass bearing to isolate the deviation.