[TowerTalk] How accurate are iPhone Compass apps?

[Mike]

My iPhone4 iOS5 comes up 90 degrees off about half the time. Should be pointing N, 
but is pointing E. It never did that with a previous OS.
73, Mike NF4L

On 1/4/2012 12:03 PM, Kevin Normoyle wrote:
> Iphone uses AKM AK8975 chip to sense the earth's magnetic field (four Hall
> effect sensors on a chip)
> so GPS isn't providing compass. I would think it's pretty accurate. Sure there's
> software and calibration, and the possibility for error, but I would imagine
> it's really good. I have a Garmin gps/compass that senses magnetic field for
> it's compass similarly.
>
> -kevin
> ad6z
>
>
>
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