Absolute position tracking using iPhone magnetometer

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A recent project I was working on required absolute positioning and while waiting for Valves lighthouse and Facebooks to open source it’s tracking solutions I thought I’d take a primitive stab at EM (electro magnetic) positioning using a phone magnetometer purely for the purpose of learning the challenges involved. I’m an experienced software developer and a hobbyist hardware hacker, so I tried solving most problems using software where possible. Continue reading