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- Q135 - Navigation Problems: Oceans
345. On 31 October your 1700 zone time DR position is LAT 27°17.0'N, LONG 116°10.0'W, when an amplitude of the Sun is observed. The Sun's center is on the visible horizon and bears 246.5° per standard magnetic compass. Variation in the area is 8.5°E. The chronometer reads 01h 01m 23s and the chronometer error is 01m 54s slow. What is the deviation of the standard compass?
The deviation of the standard compass is calculated by subtracting the variation from the compass error, which is the difference between the true bearing and the observed compass bearing. Applying this process yields a deviation of 0.8 West.
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