Compass Error by Visual Range Practice Problem 3

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Compass Error by Visual Range Practice Problem 3
3. 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?
a. 2° E
b. 2° W
c. 7° E
d. 7° W
Answer = c