This is great as long as the device itself isn't moving
Your impression here is not correct. This is great as long as the device isn't accelerating.
If your device is moving with a constant speed ( in any direction ), then the inclination result you will derive from an accelerometer reading will be correct.
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Yep you're right, I mispoke there. I've started using "moving" and "accelerating" interchangeably when I talk about my issues here but to be accurate I'm really only worried about acceleration forces.