- Masses of soft iron placed near a magnetic compass to correct for quadrantal deviation. These serve the same purpose as compass compensating magnets.
Aviation dictionary. 2014.
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quadrantal correctors — noun plural : two spheres of iron attached to the port and starboard sides of the binnacle to correct the quadrantal deviation … Useful english dictionary
Flinders bar — A Flinders bar is a vertical soft iron bar placed in a tube on the fore side of a compass binnacle. The Flinders bar is used to counteract the vertical magnetism inherent within a ship and is usually calibrated as part of the process known as… … Wikipedia