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I have 2 separate tilt-compensated magnetometer setups. One is an Invensense 9250, the other is a simpler LSM303. All I'm trying to do is compute a tilt-compensated compass heading. I've taken both sensors through standard calibration procedures that take out hard and soft iron offsets. Both produce nonsensical values (such as a full \$360^{\circ}\$ rotation going through a displayed range of \$200^{\circ} - 300^{\circ}\$. I'm reasonably certain that my math is correct. One thing I am seeing on both is that looking at raw magnetometer values, and moving the sensor without rotation a few inches above my desk noticeably changes one of the axes. The same shows itself in the computed values, with the heading changing by as much as \$20^{\circ}\$.

Having replicated this on two completely different systems, I'm starting to wonder if there's an environmental effect? I've got a glass/aluminum desk with an Apple Cinema display on it, and that's about it. Could those things be drastically affecting my magnetometer values?

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