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 004°.

Correct Answer: Option A — 1.0°E

Using the standard deviation formula: True = Compass + Deviation + Variation. With 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 004°M, the deviation is determined to be 1.0°E.