This post is a continuation with my unhealthy obsession with why the compass API on Windows Phone 7 doesn't actually point north.
I captured the following data rotating my Nokia Lumia 800 a full 360 degrees. Admittedly the rotation by hand so there is a fair bit of noise in the readings.
What it does show is:
- the Magnetic Heading drastically changing when it reaches 256°
- the declination changing from -129° to +127°
Magnetic versus True Heading
Scatter plot of magnetometer readings
Magnetometer Axis Readings by Bearing rotation - radar
Magnetometer Axis Readings by Bearing rotation - line