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How to Use Your Android Phone as Compass | How to use Digital Compass App
Best Android Compass App?
The Magnetic Compass
Compass Error Calculation - Coastal Navigation
Permanent Magnet effect on a compass
Ships Compass how to convert from True to Magnetic using variation and deviation.
Geography Mapwork: True bearing and Magnetic bearing.
Deviation of the Magnetic Compass - Swinging the compass and Deviation Card