Navigation General · Deviation
A vessel's deviation table shows 3° E on a compass heading of 090°. If the vessel swings to a compass heading of 270°, the deviation will be:
- AStill 3° E — deviation does not change with heading
- B3° W — it exactly reverses
- CA different value obtained from the deviation table for 270°✓ Correct
- DZero — deviation cancels when on a reciprocal heading
Explanation
Deviation changes with the vessel's compass heading. The value for 270° must be read from the deviation table for that heading — it will not simply reverse or remain constant.
Authority: Bowditch (Pub. 9)
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