Navigation General · Deviation
A deviation table is used primarily to:
- AConvert true headings to magnetic headings using geographic position
- BConvert between magnetic and compass headings for each compass course✓ Correct
- CDetermine the rate of annual change in local variation
- DCalibrate a GPS receiver to match magnetic north
Explanation
The deviation table lists the deviation value for each ship's heading (usually every 15° or 30°). It allows the navigator to correct the compass reading to magnetic, or apply deviation when converting from magnetic to compass.
Authority: Bowditch (Pub. 9)
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