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- Q126 - Navigation Problems: Near Coastal
87. On 11 January your 0450 ZT position is LAT 38°42'N, LONG 14°16'W. You observe Polaris bearing 358.5°pgc. At the time of the observation the helmsman noted that he was heading 160°pgc and 173°psc. The variation is 9°W. What is the deviation for that heading?
The deviation is 3W. Polaris bearing indicates a gyro error of 1.5E. Converting the gyro heading to true and then to magnetic using the variation of 9W results in a magnetic heading of 170.5M. The difference between the standard compass heading (173psc) and the calculated magnetic heading (170.5M) yields a deviation of 3W.
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