'Indoor GPS' means your phone can always find you

FINDING your way around big shopping centres or airports may soon get a lot easier. An indoor positioning system, similar to GPS, is being tested by visitors to the Kamppi shopping centre in Helsinki, Finland. GPS doesn’t work in buildings because the satellite signals it uses can’t get through walls. In this system, developed by Nokia, a cellphone can use nearby Wi-Fi transmitters instead of satellites. It triangulates their signals to calculate its position, which it then displays on a map. It is not the first indoor system but the others have mostly been for specialist uses,
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