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- Q141 - Navigation Problems: Near Coastal
121. On 26 May your 0723 zone time DR position is LAT 24°50.0'N, LONG 38°11.0'W. At that time, you observe the Sun bearing 076.5°psc. The chronometer reads 10h 25m 43s, and the chronometer error is 02m 57s fast. The variation is 7°W. What is the deviation of the standard magnetic compass?
The deviation of the standard magnetic compass is calculated by subtracting the observed compass bearing from the true azimuth, then accounting for the variation. The correct deviation is 10.7E, determined by applying the formula True = Compass + Variation + Deviation and solving for the deviation.
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