Now the north point from the Zaffarine Islands leads out to the Spanish coast again, and Gibraltar lies five or six points of the compass to this side of it--if we steer that way we shall get to Gibraltar." "All right, Massa Easy," replied Mesty, and Jack was right, with the exception of the variation, which he knew nothing about.
To make sure, Jack brought one of the compasses down from deck, and compared them.

He then lifted off the glass, counted the points of the compass to the westward, and marked the corresponding one on the binnacle compass with his pen.
"There," said he, "that is the way to Gibraltar, and as soon as the mutiny is quelled, and the wind is fair, I'll be off.".