On 7 December your 0350 ZT position is LAT 35°42'N, LONG 17°38'E. You observe Polaris bearing 359.7°pgc. At the time of the observation the helmsman noted that he was heading 016°pgc and 014°psc. The variation is 1°E. What is the deviation for that heading?

Question

On 7 December your 0350 ZT position is LAT 35&deg;42'N, LONG 17&deg;38'E. You observe Polaris bearing 359.7&deg;pgc. At the time of the observation the helmsman noted that he was heading 016&deg;pgc and 014&deg;psc. The variation is 1&deg;E. What is the deviation for that heading?

Accepted Answer

Option A: 0.3&deg;E. Polaris azimuth is determined using the LHA of Aries. With a bearing of 359.7°pgc and a gyro error of 0.3°E (calculated from Polaris), the true bearing is 0.0°. Applying variation 1°E to the true bearing gives 359°M. Comparing 359°M to 014°psc yields a deviation of 0.3°E.

On 7 December your 0350 ZT position is LAT 35&deg;42'N, LONG 17&deg;38'E. You observe Polaris bearing 359.7&deg;pgc. At the time of the observation the helmsman noted that he was heading 016&deg;pgc and 014&deg;psc. The variation is 1&deg;E. What is the deviation for that heading?

On 7 December your 0350 ZT position is LAT 35°42'N, LONG 17°38'E. You observe Polaris bearing 359.7°pgc. At the time of the observation the helmsman noted that he was heading 016°pgc and 014°psc. The variation is 1°E. What is the deviation for that heading?