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- Master & Chief Mate (Oceans or Near Coastal (Offshore Supply Vessel)) »
- Q203 - Navigation General: Near Coastal
39. Which of the following compensates for errors introduced when a vessel heels over?
A single vertical magnet beneath the compass corrects heeling error by counteracting the vertical magnetic forces that arise when a vessel heels. Heeling error results from the interaction of a ship's vertical magnetism with the Earth's magnetic field when the ship is not upright; a vertical correcting magnet opposes these forces to reduce the error. Flinders bars and soft iron spheres address deviation when the vessel is upright, while magnets within the binnacle correct semicircular deviation due to permanent magnetism.
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