On 20 July your vessel's 1626 zone time DR position is LAT 27°13.0'N, LONG 63°42.0'W, when you take an azimuth of the Sun. Determine the gyro error using the azimuth information. Chronometer time: 08h 24m 18s Chronometer error: slow 02m 12s Gyro bearing: 279.3° Variation: 15°W

Correct Answer: Option C — 1.9°W

Determine GMT using chronometer time corrected for chronometer error. Enter the Nautical Almanac to find celestial data for the DR position. Solve the PZX navigational triangle using standard Bowditch procedures to obtain true bearing, then compare with the observed gyro bearing to derive the 1.9°W gyro error.