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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q203 - Navigation General: Near Coastal
288. You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 058°.
A gyro heading of 058 with a 2W gyro error and 8W variation results in a magnetic heading of 064. The deviation is 1.5W because the swing data indicates the compass reads 1.5 higher than magnetic on that heading.
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