You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a magnetic compass heading of 166°.

Correct Answer: Option A — 1.5°W

Apply the formula: True = Compass + Deviation + Variation. Given a gyro error of 2°W and variation of 8°W, calculate the deviation by comparing the magnetic compass heading to the true heading. At a heading of 166°M, the resulting deviation is 1.5°W.