On September 9 your 2130 zone time (ZD +5) DR position is LAT 45°08'N, LONG 82°38'W. At that time, you observe Polaris bearing 000.5°pgc. The chronometer time of the observation is 02h 26m 09s, and the chronometer is 1m 43s slow. The variation is 8.7°W. What is the gyro error?

Question

On September 9 your 2130 zone time (ZD +5) DR position is LAT 45&deg;08'N, LONG 82&deg;38'W. At that time, you observe Polaris bearing 000.5&deg;pgc. The chronometer time of the observation is 02h 26m 09s, and the chronometer is 1m 43s slow. The variation is 8.7&deg;W. What is the gyro error?

Accepted Answer

Option A: 0.7&deg;E. Calculate the LHA of Aries to determine the azimuth of Polaris using the Nautical Almanac. Compare the true azimuth to the gyro bearing of 000.5°. The difference between the true bearing and the gyro bearing, accounting for the 8.7°W variation, confirms a gyro error of 0.7°E.

On September 9 your 2130 zone time (ZD +5) DR position is LAT 45&deg;08'N, LONG 82&deg;38'W. At that time, you observe Polaris bearing 000.5&deg;pgc. The chronometer time of the observation is 02h 26m 09s, and the chronometer is 1m 43s slow. The variation is 8.7&deg;W. What is the gyro error?

On September 9 your 2130 zone time (ZD +5) DR position is LAT 45°08'N, LONG 82°38'W. At that time, you observe Polaris bearing 000.5°pgc. The chronometer time of the observation is 02h 26m 09s, and the chronometer is 1m 43s slow. The variation is 8.7°W. What is the gyro error?