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 147°T, and the variation is 5°E. If the heading of your vessel at the time of the sighting is 148° per standard magnetic compass, what is the correct deviation?

Question

Accepted Answer

Option B: 6°W. True range bearing 147°T modified by 5°E variation determines magnetic bearing as 142°M. Subtracting 148° PSC standard compass heading yields a 6°W deviation, applying the standard gyro/magnetic correction mnemonic (Can Dead Men Vote Earnest).