Seen on the apple iPhone.
A built-in digital compass that works just like a magnetic needle compass can let you know which way you’re facing, digital compass rotates maps to always match the direction you’re facing. You can also use the compass on its own.
A magnetometer that works as a digital compass will enable the iPhone to determine which direction it is being held in. This will allow useful things like turn-by-turn navigation (time to ditch that satnav?) and ‘augmented reality’ apps that superimpose info about a location onto a camera view or Google Street View image.
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