On 16 June your 0430 zone time DR position is LAT 29°24.0' S, LONG 36°16.0' E. At that time, you observe Vega bearing 341.0°psc. The chronometer reads 02h 32m 06s, and the chronometer error is 01m 54s fast. The variation is 20.5°W. What is the deviation?

Correct Answer: Option C — 2.4°W

Standard navigational sight reduction for Vega establishes true azimuth. Subtracting or adding variation to true direction establishes the magnetic meridian. The discrepancy between magnetic and standard compass (psc) readings accounts for the 2.4°W deviation determined per standard piloting procedures.