How to Grab Device Compass Value

How do I get the direction of the built-in compass of a device using javascript?

There is a minimal implementation of available HTML apis (Chrome@Android) Username=dardoro&ProjectName=compass
compass script pic
Return values are alpha, beta, gamma, absolute, accordingly to the API
First read == [0,0,0,false]

Unfortunately, I do not get reliable, absolute positioning with any of my devices.

More info : W3C Device Orientation Calibration
Test HTML: Device Motion/Orientation diagnostic measurements

well, the orientation isn't gonna be perfect.

Unfortunately, I cant test this right now because I am using my chromebook.

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