You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°E. The variation is 8°W. Find the deviation on a gyro heading of 037°.

Correct Answer: Option C — 1.0°W

True heading is derived from gyro heading plus gyro error (037° + 2° = 039°T). Applying the variation of 8°W (-8°) to find magnetic heading (047°M) and comparing it to true/magnetic relationships yields a deviation of 1.0°W following standard compass calibration rules.