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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q108 - Navigation Problems: Near Coastal
26. You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 039°.
PSC PGC
030.5° 024°
061.5° 054°
092.0° 084°
122.5° 114°
152.0° 144°
181.0° 174°
210.0° 204°
239.5° 234°
269.0° 264°
298.0° 294°
327.5° 324°
358.5° 354°
The deviation at a gyro heading of 039 is 1.0W. This was determined by applying the gyro error and variation, calculating deviations at nearby headings, and interpolating to find the deviation at the specified heading.
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