On 19 November your 0146 ZT position is LAT 33°48'N, LONG 25°22'E. You observe Polaris bearing 359.8°pgc. At the time of the observation the helmsman noted that he was heading 224°pgc and 222.5°psc. The variation is 2°E. What is the deviation for that heading?

Correct Answer: Option A — 1.0°W

Compass error is derived by comparing observed celestial azimuth to gyro bearing. Applying easterly variation to true heading establishes magnetic heading. The angular difference between magnetic heading and standard compass heading yields deviation, resulting in 1.0°W per standard celestial navigation reduction procedures.