On 23 August at 0604 ZT, in DR position LAT 16°42.3'S, LONG 28°19.3'W, you observed an amplitude of the Sun. The lower limb was a little above the horizon, and the Sun bore 076.0°pgc. At the time of the observation, the helmsman reported that he was heading 143°pgc and 167° per standard magnetic compass. The variation in the area was 23°W. What were the gyro error and deviation for that heading?

Question

Accepted Answer

Option C: 2°E GE, 1°E DEV. Comparing observed Sun azimuth (076.0°pgc) with calculated true amplitude determines gyro error. The difference between gyro heading (143°pgc) and standard magnetic heading (167°psc), combined with 23°W variation, resolves the magnetic compass deviation to 1°E and gyro error to 2°E.