>>It would be nice it I could just find an example HTML5 page out there where this works ;-}
>
>This looks promising http://stackoverflow.com/questions/18112729/calculate-compass-heading-from-deviceorientation-event-api
>
>Look at the first answer
>There's a link to an example http://people.opera.com/richt/release/tests/orientation/spec_workedexample.html

I also found that a few minutes ago. The code is basically the same as I'm trying and, on my device at least, just as useless :-{
Just varying either the x or y axis gives hugely different heading results (including at 'steep' angles Nan)

Do you have a device you could try that page on ?
Anybody ?