Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 178°T, and the variation is 9°W. If the heading of your vessel at the time of the sighting is 180° per standard magnetic compass, what is the deviation?

Question

Accepted Answer

Option A: 7°E. True range of 178°T combined with 9°W variation establishes a magnetic direction of 187°M. Comparing this to the standard compass heading of 180°psc results in a deviation of 7°E using standard compass correction rules.