At 1610 ZT on 14 August, in DR position LAT 33° 24.6' S, LONG 028°15.4'W, you observe an amplitude of the Moon. The center of the Moon is on the visible horizon and bears 111.0° psc. The variation is 2° E. What is the deviation?

Correct Answer: Option A — 1.1°W

Amplitude observations at the visible horizon involve computing true bearing using latitude and declination. Applying variation yields magnetic direction, allowing navigators to compute deviation from the compass bearing.