On 16 June your 0430 zone time DR position is LAT 29°24.0'S, LONG 36°16.0'E. At that time, you observe Vega bearing 341.0°psc. The chronometer reads 02h 32m 06s, and the chronometer error is 01m 54s fast. The variation is 20.5°W. What is the deviation?

Question

On 16 June your 0430 zone time DR position is LAT 29&deg;24.0'S, LONG 36&deg;16.0'E. At that time, you observe Vega bearing 341.0&deg;psc. The chronometer reads 02h 32m 06s, and the chronometer error is 01m 54s fast. The variation is 20.5&deg;W. What is the deviation?

Accepted Answer

Option C: 2.4&deg;W. Star amplitude and azimuth calculations using the navigational triangle for Vega provide the true bearing. Applying 20.5°W variation gives the magnetic bearing, which compared to the 341.0°psc observation yields a compass deviation of 2.4°W.

On 16 June your 0430 zone time DR position is LAT 29&deg;24.0'S, LONG 36&deg;16.0'E. At that time, you observe Vega bearing 341.0&deg;psc. The chronometer reads 02h 32m 06s, and the chronometer error is 01m 54s fast. The variation is 20.5&deg;W. What is the deviation?

On 16 June your 0430 zone time DR position is LAT 29°24.0'S, LONG 36°16.0'E. At that time, you observe Vega bearing 341.0°psc. The chronometer reads 02h 32m 06s, and the chronometer error is 01m 54s fast. The variation is 20.5°W. What is the deviation?