On 22 April your 0344 zone time DR position is LAT 21°16.0'N, LONG 107°32.0'W. At that time, you observe Spica bearing 236°psc. The chronometer reads 10h 45m 16s, and the chronometer error is 00m 25s fast. The variation is 7.5°E. What is the deviation of the standard compass?

Question

On 22 April your 0344 zone time DR position is LAT 21&deg;16.0'N, LONG 107&deg;32.0'W. At that time, you observe Spica bearing 236&deg;psc. The chronometer reads 10h 45m 16s, and the chronometer error is 00m 25s fast. The variation is 7.5&deg;E. What is the deviation of the standard compass?

Accepted Answer

Option B: 5.2&deg;E. Compass error is determined by comparing True azimuth from celestial sight calculations with standard compass bearing. Applying Westerly variation and Easterly deviation rules per Bowditch yields a deviation of 5.2 degrees East, satisfying standard navigator verification protocols.

On 22 April your 0344 zone time DR position is LAT 21&deg;16.0'N, LONG 107&deg;32.0'W. At that time, you observe Spica bearing 236&deg;psc. The chronometer reads 10h 45m 16s, and the chronometer error is 00m 25s fast. The variation is 7.5&deg;E. What is the deviation of the standard compass?

On 22 April your 0344 zone time DR position is LAT 21°16.0'N, LONG 107°32.0'W. At that time, you observe Spica bearing 236°psc. The chronometer reads 10h 45m 16s, and the chronometer error is 00m 25s fast. The variation is 7.5°E. What is the deviation of the standard compass?