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- Q134 - Navigation Problems: Near Coastal
73. You wish to check the deviation of your standard magnetic compass. You find a natural range that you steer for and note that the gyrocompass heading is 034°, and the heading by standard magnetic compass is 026°. The gyro error is 1°W. Variation is 9°E. What is the deviation for that heading?
The correct deviation is 2W. This is determined by calculating the magnetic heading from the gyro heading and gyro error, then subtracting the compass heading from the magnetic heading to find the deviation.
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