On 6 November your 0752 zone time DR position is LAT 25°11.0'N, LONG 76°07.0'W. At that time, you observe the Sun bearing 119°psc. The chronometer reads 12h 53m 07s, and the chronometer error is 01m 19s fast. The variation is 3°W. What is the deviation of the standard magnetic compass?

Correct Answer: Option A — 3.2°E

Greenwich Mean Time is determined using chronometer time corrected for chronometer error. Using the DR position and sight reduction tables (Pub. No. 229/249), calculate the computed azimuth (Zn). Compare true azimuth to standard compass bearing (psc) to find compass error, then apply variation to determine deviation.