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The upper “Black” scale (the one more usually used) reads directly in gauss of a uniform magnetic field oriented parallel with the centerline of the instrument scale
Compensation built in
others require greater concentration
Indian Ocean - Approaches to Cocos (Keeling) Islands 1 : 150 000
When shown in the “Red” scale
How Boat Things Work russell islands The upper “Black” scale (theA fully illustrated tour through modern systems that power, steer, and control both power and sailboats. Features over 100 cutaway and exploded drawings with detailed explanations of eighty principle devices. Author: Charlie Wing 171 pages 275 x 215 x 10mm Paperback
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