Not entirely accurate
I haven't tried any other compass apps yet. This one is very slick, floating like the "8-ball" in the Apollo spacecraft. But it is not entirely accurate (compared to a physical compass). I don't know if this is due to the app, the sensors in my iPad, or some unknown magnetic field near where I've tested. The arrow usually points in a northward direction, off by about 5 or 10 degrees. Sometimes I've seen it point in a wildly wrong direction, perhaps slowly floating around to north, if one waits long enough.
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