When developing, I keep my G1 on my desk with a desk fan plus some couple rare earth magnets I fiddle with when bored (maybe they're not the best fiddle toy). Not surprisingly, the magnets really knock the magnetic compass out of whack, but the desk fan does too, even at a foot or two away. So it's pretty sensitive, and pretty useless for determining true north if there's any sort of magnetic pollution. That's not the device's fault -- the earth's field is relatively weak compared to a nearby motor.
More interestingly, I've also found that it takes a while to return to normal after being confused. Taking the phone outside or otherwise away from magnetic pollution and it still does not find magnetic north accurately. I haven't timed it, but there does seem to be some re- calibration happening. When I haven't confused it, the G1's magnetic compass agrees with other magnetic compasses, so I'd guess it's correct to within 5-10 degrees in a magnetically clean environment. It's not rocky steady -- it seems to fluctuate a little, so there's some noise in the signal. > the compass measures the local magnetic field, and as such might be > influenced by various electronics devices around the phone. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
