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The Remote Indicating Compass (Slaved Gyro Compass)
How to Use Your Android Phone as Compass | How to use Digital Compass App
The Magnetic Compass
Coefficient D & Soft Iron Spheres
Best Android Compass App?
Compass Pro: Maps, GPS , Weather
Understanding Sensor Fusion and Tracking, Part 2: Fusing a Mag, Accel, & Gyro Estimate
Deviation of the Magnetic Compass - Swinging the compass and Deviation Card