On 9 September your 2043 ZT position is LAT 24°18'N, LONG 66°46'W. You observe Polaris bearing 001°pgc. At the time of the observation the helmsman noted that he was heading 031°pgc and 040°psc. The variation is 11°W. What is the deviation for that heading?

Question

On 9 September your 2043 ZT position is LAT 24&deg;18'N, LONG 66&deg;46'W. You observe Polaris bearing 001&deg;pgc. At the time of the observation the helmsman noted that he was heading 031&deg;pgc and 040&deg;psc. The variation is 11&deg;W. What is the deviation for that heading?

Accepted Answer

Option D: 2&deg;E. Polaris bears 000° True. A bearing of 001° pgc indicates a gyro error of 1° W. Applying this to the heading 031° pgc yields a True heading of 030°. Using the formula True = Compass + Variation + Deviation, 030° = 040° + (-11°) + Deviation, which solves to a deviation of 2° E.

On 9 September your 2043 ZT position is LAT 24&deg;18'N, LONG 66&deg;46'W. You observe Polaris bearing 001&deg;pgc. At the time of the observation the helmsman noted that he was heading 031&deg;pgc and 040&deg;psc. The variation is 11&deg;W. What is the deviation for that heading?

On 9 September your 2043 ZT position is LAT 24°18'N, LONG 66°46'W. You observe Polaris bearing 001°pgc. At the time of the observation the helmsman noted that he was heading 031°pgc and 040°psc. The variation is 11°W. What is the deviation for that heading?