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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q107 - Navigation Problems: Chart Plot
30. Your vessel's heading is 330°pgc and 345°psc with a 2°E gyro error. What is the deviation on this heading?
The deviation is 3W. This is calculated by first determining the true heading (332T) from the gyro heading and gyro error, then finding the compass error relative to true (-13), and finally separating the compass error into variation (-10) and deviation (-3).
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