digital compass modules

[Sébastien Lorquet]

I'm not sure a magnetic sensor is useful when you have a GPS, because a GPS
can give you a heading as soon as the measured velocity is not zero!

However I think it's possible to calibrate a magnetic sensor so that it
forgets its close magnetic environment and is only sensitive to the intented
magnetic signals. The magnetic environment is stored as a "fingerprint" and
is then substracted to the raw measurements to get a correct value.

Sebastien
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