Help Digital Compass & Sensors

[Twyzer]

My digital compass gone mad. Actually I've discovered that it not points to where is should be, and if I turn my tab clockwise, the small arrow will turn counter-clockwise. When I use it upside down however, it works fine. Also the app Compass works, and showing the right directions. Weird.

Also my sensors aren't precisely configured, so for instance my phone senses it's in a horizontal position when it's actually like ~20

 

[Doc99]

Holding it flat in front of you tip it up 90 degrees so the top of the Tab is pointing straight up, then down so the top of the Tab is pointing to the floor. Then holding it flat in front of you rotate the Tab left so the right edge is facing the ceiling, then rotate right so the left edge is up. Return to original position. This should calibrate your device.
This works for me and I found this in a post for the EVO.