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- Q135 - Navigation Problems: Oceans
315. On 28 November your vessel's 0652 DR position is LAT 37°30'N, LONG 124°12'W, when an amplitude of the Sun is observed. The Sun's center is on the visible horizon and bears 103° per standard magnetic compass. Variation in the area is 16.3°E. The chronometer reads 02h 54m 18s and is 02m 06s fast. What is the deviation of the compass?
The compass deviation is 2.5W. The true bearing, calculated from the latitude and declination, is 116.8. Subtracting the observed compass bearing of 103 and accounting for the 16.3E variation yields a westward deviation of 2.5.
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