(ˈflɪndəz) n (Navigation) nautical a bar of soft iron mounted on a binnacle to compensate for local magnetism causing error to the compass[C19: named after Matthew Flinders (died 1814), English navigator]
Flinders bar
Flinders bar
[′flin·dərz ‚bär] (navigation) A bar of soft unmagnetized iron placed vertically near a magnetic compass to counteract deviation caused by magnetic induction in vertical soft iron of the craft.