Iphone 5s motion sensor problem?

On my iphone 5s, Whenever i open the compass app, calibrate, and go to the leveling thing and i put it on a flat surface, it is always off by -1 or 1 degree, while my dads iphone 5 reads zero, and so dies my mothers iphone 5c. Is your iphone 5s also off by one degree? Thank yiu for your answers.

My iphone is off by 98.6 degrees… Lmao!

The magnetometers and other sensors in the phone are optimized to detect motion rather than absolute position. Even a traditional magnetic compass is rarely connect to within a few degrees. Your location is more reliable than the position of the phone in space.

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