Navigation General · Deviation
Deviation can be reduced or nearly eliminated by:
- AApplying a correction factor in the chart plotting
- BSwinging the ship and adjusting corrector magnets and soft-iron spheres✓ Correct
- CInstalling a fluxgate sensor near the keel
- DUsing a deviation table with entries every 5 degrees
Explanation
Compass adjustment (compensation) involves swinging the ship through all headings and placing corrector magnets and Flinders bar or soft-iron spheres to counteract the vessel's disturbing fields. Residual deviation is recorded in the deviation table.
Authority: Bowditch (Pub. 9)
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