Your vessel is proceeding up a channel, and you see a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 212°T, and the variation is 7°W. If the heading of your vessel at the time of the sighting is 208° per standard magnetic compass, what is the correct deviation?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 11°E
True range bearing 212°T combined with 7°W variation establishes magnetic bearing at 219°M. Comparing magnetic bearing to the 208° PSC compass heading produces an 11°E deviation, derived via standard deviation computation principles.
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