On 11 July your 0240 ZT position is LAT 14°52'N, LONG 34°23'W. You observe Polaris bearing 359.8°pgc. At the time of the observation the helmsman noted that he was heading 279°pgc and 299°psc. The variation is 19°W. What is the deviation for that heading?

Question

On 11 July your 0240 ZT position is LAT 14&deg;52'N, LONG 34&deg;23'W. You observe Polaris bearing 359.8&deg;pgc. At the time of the observation the helmsman noted that he was heading 279&deg;pgc and 299&deg;psc. The variation is 19&deg;W. What is the deviation for that heading?

Accepted Answer

Option A: 0&deg;. Polaris is assumed to bear 000° True. With a bearing of 359.8° pgc, the gyro error is 0.2° E. Applying this to the heading 279° pgc yields a True heading of 279.2°. Using the formula Compass + Deviation = Magnetic and Magnetic + Variation = True, deviation calculates to 0°.

On 11 July your 0240 ZT position is LAT 14&deg;52'N, LONG 34&deg;23'W. You observe Polaris bearing 359.8&deg;pgc. At the time of the observation the helmsman noted that he was heading 279&deg;pgc and 299&deg;psc. The variation is 19&deg;W. What is the deviation for that heading?

On 11 July your 0240 ZT position is LAT 14°52'N, LONG 34°23'W. You observe Polaris bearing 359.8°pgc. At the time of the observation the helmsman noted that he was heading 279°pgc and 299°psc. The variation is 19°W. What is the deviation for that heading?