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- Q141 - Navigation Problems: Near Coastal
140. On 9 February your 0739 zone time DR position is LAT 23°31.0'N, LONG 143°41.0'E. At that time, you observe the Sun bearing 104.5°psc. The chronometer reads 09h 37m 12s, and the chronometer error is 01m 52s slow. The variation is 3.5°W. What is the deviation of the standard magnetic compass?
The deviation is 8.6E. The difference between the calculated true bearing and the observed compass bearing (5.1E) combined with the variation (3.5W) determines the deviation using the formula True = Compass + Variation + Deviation.
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