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The Ship as a Magnet
The Soft Iron of a Ship
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approximate coefficients athwartship magnets azimuth binnacle blue pole cause circle of deviations compass course Compass heading compass needle compass record compensation component correction correctors corresponding compass curve deck degree of heel distance draw earth and ship earth's force earth's horizontal force east and west east or west easterly effect exact coefficients Flinders bar force H force of earth fore-and-aft and athwartship fore-and-aft magnets formula gyro heeling adjuster heeling error heeling magnet hour angle inches latitude lubber line magnetic course magnetic heading magnetic north minus minutes of arc navigator netic observations parameter pilot house placed pole position quadrantal deviation quadrantal error red ends semicircular deviation ship built head ship swings ship's head standard compass starboard steel steering subpermanent magnetism sun bears tion true bearing variation versin vertical force vertical iron vertical soft iron vessel viation vibrations westerly deviation zero