On 5 August your 0310 ZT position is LAT 09°02'N, LONG 21°08'W. You observe Polaris bearing 002°pgc. At the time of the observation the helmsman noted that he was heading 316°pgc and 329°psc. The variation is 15°W. What is the deviation for that heading?

Correct Answer: Option C — 0.5°E

Polaris azimuth is approximately 000° True. With a bearing of 002°pgc, the gyro error is 2°W. Since the vessel heads 316°pgc and 329°psc, the compass error is 13°W. Subtracting the 15°W variation from the 13°W compass error yields a deviation of 0.5°E, following standard compass error correction procedures.