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- Q134 - Navigation Problems: Near Coastal
219. On 7 December your vessel's 0835 zone time DR position is LAT 28° 30.0' N, LONG 125° 39.3' W, when an azimuth of the Sun is observed. The chronometer time of the sight is 04h 34m 48s, and the Sun is bearing 113° per standard magnetic compass. The chronometer error is 01m 24s slow, and the variation in the area is 13.0° E. What is the deviation of the standard magnetic compass?
The compass deviation is calculated by subtracting the magnetic azimuth from the observed compass bearing. The Sun's true azimuth was determined from the Nautical Almanac, corrected for variation, and compared to the observed compass bearing to find a deviation of 2.3 E.
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