153. On 19 November your 0146 ZT position is LAT 33°48'N, LONG 25°22'E. You observe Polaris bearing 359.8°pgc. At the time of the observation the helmsman noted that he was heading 224°pgc and 222.5°psc. The variation is 2°E. What is the deviation for that heading?

The deviation on a heading is calculated by subtracting the magnetic heading from the compass heading. Given a gyro error of 0.5W, a true heading of 223.5, a variation of 2E, and a compass heading of 222.5psc, the magnetic heading is 221.5M. Therefore, the deviation is 1.0W.