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- Q135 - Navigation Problems: Oceans
174. On 17 June your 0815 zone time DR position is LAT 25°27.0'N, LONG 47°16.0'W. At that time, you observe the Sun bearing 079.5°psc. The chronometer reads 11h 15m 03s, and the chronometer error is 01m 15s fast. The variation is 3°E. What is the deviation of the standard magnetic compass?
The compass deviation is calculated as the true bearing minus the variation minus the observed compass bearing. Applying this formula with the given values yields a deviation of 3.5 West.
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