On 3 October your 0330 zone time (ZD + 5) DR position is LAT 47°41'N, LONG 86°49'W. At that time, you observe Polaris bearing 357.5°pgc. The chronometer time of the observation is 08h 32m 04s, and the chronometer is 0m 27s slow. The variation is 5.5°W. What is the gyro error?

Question

On 3 October your 0330 zone time (ZD + 5) DR position is LAT 47&deg;41'N, LONG 86&deg;49'W. At that time, you observe Polaris bearing 357.5&deg;pgc. The chronometer time of the observation is 08h 32m 04s, and the chronometer is 0m 27s slow. The variation is 5.5&deg;W. What is the gyro error?

Accepted Answer

Option D: 2.0&deg;E. Calculate the True Azimuth of Polaris using the Nautical Almanac for the observation time. The True bearing is 359.5°. The Gyro bearing is 357.5°. The difference between the True bearing and the Gyro bearing is 2.0°E, indicating the gyro error is 2.0°E (Gyro Best, Error East).

On 3 October your 0330 zone time (ZD + 5) DR position is LAT 47&deg;41'N, LONG 86&deg;49'W. At that time, you observe Polaris bearing 357.5&deg;pgc. The chronometer time of the observation is 08h 32m 04s, and the chronometer is 0m 27s slow. The variation is 5.5&deg;W. What is the gyro error?

On 3 October your 0330 zone time (ZD + 5) DR position is LAT 47°41'N, LONG 86°49'W. At that time, you observe Polaris bearing 357.5°pgc. The chronometer time of the observation is 08h 32m 04s, and the chronometer is 0m 27s slow. The variation is 5.5°W. What is the gyro error?