On 11 July your 0240 ZT position is LAT 14°52'N, LONG 34°23'W. You observe Polaris bearing 359.8°pgc. At the time of the observation the helmsman noted that he was heading 279°pgc and 299°psc. The variation is 19°W. What is the deviation for that heading?

Correct Answer: Option A — 0°

Polaris observations corrected for local hour angle yield true azimuth approximately equal to true North. Gyro error is found by comparing Polaris true bearing with gyro bearing; applying gyro error, variation (19°W), and compass heading (299°psc) calculates a deviation of 0°.