Definition of Flinders bar in US English:

Flinders bar


  • A bar of soft iron placed vertically in or near the housing of a ship's compass to correct deviation caused by the local magnetic field of the ship.

    • ‘Permanent magnets or iron placed near the compass are used for compensation; an iron Flinder's bar is one example.’
    • ‘In ship's compasses, the compasses usually have to be equipped with an iron Flinder's bar and maybe quadrantial spheres; they're supposed to eliminate compass deviation caused by a ship's hull.’


Late 19th century: name after Captain Matthew Flinders, Matthew.