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- Q134 - Navigation Problems: Near Coastal
376. 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 true heading of 319°.
The deviation is calculated by subtracting the variation and gyro error from the observed compass-gyro difference. Given a gyro error of 2W, a variation of 8W, and a compass-gyro difference of 7.5W on a true heading of 319, the deviation is 2.5E.
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