Navigation General · Deviation
Deviation is caused by:
- AThe geographic location of the vessel
- BMagnetic materials and electrical currents aboard the vessel itself✓ Correct
- CSolar and lunar gravitational pull on the compass needle
- DThe difference between geographic and magnetic poles
Explanation
Deviation is the error in the magnetic compass caused by the vessel's own magnetic field — permanent magnetism in the hull, engines, electrical wiring, and cargo. It changes with the ship's heading.
Authority: Bowditch (Pub. 9)
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