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- Apprentice Mate Steersman (Oceans or Near Coastal (Any Appropriate Tonnage)) »
- Q413 - Navigation General: Oceans
21. What causes deviation in a magnetic compass?
Deviation results from the magnetic influence of the vessel itself, distorting the Earth's magnetic field and affecting the compass reading. This distinguishes deviation from variation, which is caused by the Earth's magnetic field, and local attraction, which is caused by external magnetic sources.
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