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A magnetometer (the formal term for a digital compass) is a scientific instrument used to measure the strength and/or direction of the magnetic field in the vicinity of the instrument. The compass is present in all iPhones since the 3G[S] and all iPad models. The compass found in the iPhone 3GS is the AKM Semiconductor AKM8973, whereas the iPhone 4 and iPad use the AKM Semiconductor AKM8975. [1]