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adjust the heeling aligned amount of Flinders approximate coefficients arrangements of horizontal athwartship C magnets azimuth circle binnacle calculated cardinal headings Chapter compass card compass course compass errors compass heading compass location compass needle Compass Record components corrected degaussing coils Degrees Degrees Degrees deviation curve deviations on compass dip needle dockside earth's magnetic field Figure Flinders bar adjustment Flinders bar length fore-and-aft B magnets fore-and-aft line forward or aft geographic pole gyro compass gyro repeater H.O. Pub heeling magnet horizontal soft iron hour angle indicated induced effects induced magnetism intercardinal headings lubber's line MAGNETIC COMPASS ADJUSTMENT magnetic deviation magnetic effects magnetic latitude magnetic meridian Maximum deviation meridian angle Naval Oceanographic Office NAVSHIPS needle induction netic North heading pelorus permanent magnetic field place the ship polarity position procedure quadrantal resultant ship swings slewing spheres sun's azimuth tion true heading U.S. Navy unsymmetrical arrangements variation vertical induced