javascript - How do I get compass heading from DeviceOrientation in the Google Glass Browser? -

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the web browser built google glass of firmware version xe7 provides deviceoreientation events, values don't seem come expected frame of reference. how can 1 proper compass headings out of this? glass positioned on head:

deviceorientationevent

beta

     90  upright , level     -90  inverted , level       0  looking straight or down

gamma

     90  right ear towards floor     180  looking straight 270/-90  left ear down       0  looking straight down

alpha

this property not stable when glass horizontal (what should useful orientation using compass direction, determine wearer looking). gives stable readings when glass tilted above or below horizon.

above horizontal

     90  north       0  east     180  west     270  south

below horizontal

    270  north     180  east       0  west      90  south

may can idea on how control compass newly launched sample


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