On 28 November your vessel's 0712 zone time DR position is LAT 26°54'S, LONG 45°18'W, when you take an azimuth of the Sun. Determine the gyro error using the azimuth information. Chronometer time: 10h 09m 18s Chronometer error: slow 02m 54s Gyro bearing: 102°

Correct Answer: Option B — 0.6°W

Determine GMT from chronometer time and error, then enter the Nautical Almanac for celestial coordinates at the DR position. Solve the navigational triangle using celestial sight reduction formulas detailed in Bowditch to find true azimuth. Compare the computed true azimuth with the observed gyro bearing to determine the gyro error.