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?

Correct Answer: Option A — 8.6°E

Determine GMT from chronometer readings, apply longitude to find LHA, and use sight reduction tables to compute the celestial body's true azimuth (Zn). Subtract compass bearing from Zn to find compass error, then apply variation to determine the standard magnetic compass deviation.