On 6 November your vessel's 0706 zone time DR position is LAT 25°30.0'N, LONG 85°35.0'W, when an azimuth of the Sun is observed. The chronometer time of the sight is 01h 03m 30s, and the Sun is bearing 114.0°pgc. The chronometer error is 02m 30s slow, and the variation in the area is 2°W. What is the gyro error?

Question

Accepted Answer

Option B: 2.0°E. Gyro error is determined by comparing gyro bearing to true azimuth derived from celestial observations processed through the Nautical Almanac. Applying chronometer time, rate corrections, and local variation per Bowditch methods isolates gyro error as 2.0°E.