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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 cause circle of deviations compass course Compass heading compass needle compass record compensation component computed correction correctors corresponding compass deck degree of heel draw earth and ship earth's force earth's horizontal force east and west east or west easterly effect exact coefficients example 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 Key West latitude lubber line magnetic course magnetic heading magnetic north method minus minutes of arc navigator netic observations obtained parameter pilot house placed pole position quadrantal deviation quadrantal error quadrantal spheres red ends semicircular deviation ship swings ship's head standard compass starboard steel steering subpermanent magnetism sun bears swing tion variation versin vertical force vertical iron vertical soft iron vessel viation vibrations westerly deviation zero