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by arrrg 4641 days ago
Apple’s built-in compass (which has not calibration) also shows many devices to be off. I’m not sure why that person chose a third-party app to show this off.

This is a real issue.
1 comments
andyhmltn 4640 days ago
AFAIK you can calibrate the compass. At least in iOS7. But using an iPhone 5 I always find the compass to be incorrect most of the time.
link