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floo
floo

Reputation: 13

What accuracy and precision can I expect from the iphone magnetometer?

What accuracy and precision can I expect from the iphone magnetometer? That is, how close is the reported result to the "true" bearing and what uncertainty is typically reported?

Upvotes: 1

Views: 1690

Answers (1)

Daniel Waghorn
Daniel Waghorn

Reputation: 2985

The iPhone 4S, 5 and 5C contain good quality components and the compass readings are generally accurate to +/-1 degree – better than can be achieved with a traditional hand-held Brunton or Silva compass. Unfortunately the magnetometer/gyroscope/accelerometer combination in the iPhone 5S is of lower quality and the compass is only accurate to +/-5 degrees.

This is of course assuming that the magnetometer has been calibrated, although the phone will typically prompt you to perform the calibration is the software determines the sensor input to be unreliable.

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Upvotes: 1

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