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 true heading of 258°.

Correct Answer: Option B — 1.0°E

True heading equals compass heading plus or minus deviation and variation. With a gyro error of 2°E, the true heading is 260°. Given variation is 8°W, the magnetic heading is 268°. The difference between the magnetic heading (268°) and the compass heading (258°) results in a 1.0°E deviation.