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Mapping software
Mapping software works with your phone's GPS for the location and then the in-built finds north, adjusting to the direction you're facing and the way. But that's not easy because there are two 'norths'. There's north - which is the direction of the North Pole and which reliably stays put - and there's north which, thanks to the flowing layer of molten iron in the Earth's outer , has a habit of moving around.
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