On 2 March your 2216 ZT DR position is LAT 21°20.0'S, LONG 17°10.0'W. At that time, you observe Saturn bearing 078°psc. The chronometer reads 11h 14m 04s, and the chronometer error is 02m 20s slow. The variation is 4.5°W. What is the deviation of the standard compass?

Correct Answer: Option A — 3.6°E

Compute Greenwich Mean Time from chronometer time and error, then find local hour angle to determine true bearing via celestial sight reduction. Comparing the true bearing to the standard compass bearing using the formula True = Compass +/- Deviation +/- Variation reveals a deviation of 3.6°E.