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- Q142 - Navigation Problems: Oceans
247. On 31 May your vessel's 1420 zone time DR position is LAT 29° 06' N, LONG 120° 06' W, when an azimuth of the Sun is observed. The bearing of the Sun per standard magnetic compass was 255.3°. The chronometer time of the observation is 10h 17m 24s. The chronometer error is 02m 32s slow. The variation for this area is 12.9° E. What is the deviation of the standard magnetic compass?
The compass deviation is 2.5 W, calculated by subtracting the compass bearing and variation from the true azimuth derived from sight reduction.
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