Navigation Problems USCG Question #622 (Set 18)

On 23 August in DR position LAT 24°07.0'N, LONG 136°16.0'E, you observe an amplitude of the Sun. The Sun's center is on the visible horizon and bears 074.5°psc. The chronometer reads 08h 56m 19s and is 02m 34s fast. Variation in the area is 2°W. What is the deviation of the magnetic compass?

Official USCG Answer & Rule Citation

Correct Answer: Option D — 4.5°E

Solar amplitude calculations require determining the Sun's true bearing at theoretical sunrise or sunset using latitude and declination from the Nautical Almanac. Comparing true azimuth against standard compass bearing (psc) and applying local variation yields the residual compass deviation.

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