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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q109 - Navigation Problems: Oceans
488. On Sunday, 8 November, your ship is enroute from Texas City, TX, to Portland, ME. At 0632 ZT, you fix your position at LAT 27°06'N, LONG 90°36'W. When the lower limb of the Sun was two-thirds of a diameter above the visible horizon, the Sun bore 105° per standard magnetic compass. At this time the chronometer read 12h 39m 20s and is 3m 20s slow. If the variation is 3°E, determine the deviation of the standard compass.
The deviation is 0.8E. The Sun's true bearing was 108.8T, which, after applying the 3E variation, becomes 105.8M. The observed compass bearing was 105, indicating a 0.8E deviation because the compass reading is less than the magnetic bearing.
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