Compass Error by Visual Range Practice Problem 4

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Compass Error by Visual Range Practice Problem 4
4. 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 064° T, and the variation is 17° W. If the heading of your vessel at the time of the sighting is 094° per standard magnetic compass, what is the correct deviation?
a. 4° E
b. 4° W
c. 13° E
d. 13° W
Answer = d