On 30 July, your 0200 zone time (ZD +4) DR position is LAT 43°48'N, LONG 78°00 W. At that time, you observe Polaris bearing 008.7°psc. The chronometer time of the observation is 05h 58m 07s, and the chronometer is 0m 23s slow. The variation is 10.5°W. What is the deviation of the magnetic compass?

Question

On 30 July, your 0200 zone time (ZD +4) DR position is LAT 43&deg;48'N, LONG 78&deg;00 W. At that time, you observe Polaris bearing 008.7&deg;psc. The chronometer time of the observation is 05h 58m 07s, and the chronometer is 0m 23s slow. The variation is 10.5&deg;W. What is the deviation of the magnetic compass?

Accepted Answer

Option B: 3.0&deg;E. Polaris azimuths are determined using the LHA of Aries. After calculating the true azimuth of 005.7°T and comparing it to the compass bearing of 008.7°psc, the compass error is 3.0°W. Applying the 10.5°W variation, the deviation is calculated as 3.0°E, following standard celestial navigation procedures for compass checks.