Uttmark's guide to the United States local inspectors examination for masters and mates of ocean going steam and sailing ships (1919)
Uttmark, Fritz E · [New York] The Author · leaf 51
Fig. 43. 68.—*What is Deviation of the Compass? The Deviation of the Compass is the angulardifference between the com-pass meridian (the compassNorth and South line) andthe Magnetic Meridian. Itis caused by iron in the con-struction of the ship or inher cargo, also by temporarylocal attraction. … Fig. 44. 24 DEFINITIONS Diagrams ShowingVariation and Deviation T C VARlAltON ISWESTERt TOTAUIBROR d*tAaT£iay
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