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- Q134 - Navigation Problems: Near Coastal
139. On 17 April your 1610 ZT DR position is LAT 22° 07.0' N, LONG 158° 16.0' W. At that time, you observe the Sun bearing 271° psc. The chronometer reads 03h 08m 52s, and the chronometer error is 01m 16s slow. The variation is 4° E. What is the deviation of the standard magnetic compass?
The correct deviation is calculated by subtracting the observed compass bearing, variation, from the true azimuth obtained from the Nautical Almanac. This yields a deviation of 2.3 W.
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