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- Q135 - Navigation Problems: Oceans
117. On 14 January your 0746 zone time DR position is LAT 26°37.0'N, LONG 153°19.0'W. At that time, you observe the Sun bearing 123°psc. The chronometer reads 05h 49m 16s, and the chronometer error is 02m 29s fast. The variation is 3°W. What is the deviation of the standard magnetic compass?
The deviation of the standard magnetic compass is 1.4W. This is determined by calculating the Sun's true azimuth using the Nautical Almanac, then applying the TVMDC formula (True → Variation → Magnetic → Deviation → Compass) to account for variation and solve for deviation.
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