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- Q135 - Navigation Problems: Oceans
368. On 6 November your 0752 zone time DR position is LAT 25° 11.0' N, LONG 76° 07.0' W. At that time, you observe the Sun bearing 119° psc. The chronometer reads 12h 53m 07s, and the chronometer error is 01m 19s fast. The variation is 3° W. What is the deviation of the standard magnetic compass?
The deviation of the standard magnetic compass is calculated using the formula True Bearing + Variation + Deviation = Compass Bearing. Given the observed Sun bearing, DR position, chronometer readings, and variation, the deviation is determined to be 3.2 East.
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