Quotation from: The Cruise of the Snark

Written by: Jack London


"The Correct Magnetic Course is derived from the True Course by
applying to it the variation."


Therefore, I reasoned, if the compass points 9 degrees 40 minutes
eastward of north, and I wanted to sail due north, I should have to
steer 9 degrees 40 minutes westward of the north indicated by the
compass and which was not north at all. So I added 9 degrees 40
minutes to the left of my west-by-south course, thus getting my
correct Magnetic Course, and was ready once more to run to open sea.

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