adjustment of the compass

The Sailor's Word-Book

Swinging a ship to every point of bearing, to note the variation or error of the needle upon each rhumb, due to the local attraction of the iron, or the mass, on each separate compass bearing. Thus, in lat. 76° N. it was found to be +22° 30′ with the head W.S.W., and -56° 30′ on the opposite bearing, or E.N.E.

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