A team of engineers has released a program that uses anomalies in the Earth's magnetic field to locate smartphone users inside buildings to within 0.1 and two metres accuracy -- a method employed by birds, lobsters and sea turtles.
Unlike traditional tracking services, there is no need for an internet connection -- Finnish firm IndoorAtlas has made use of the compasses already built into most smartphones, along with manipulations in the Earth's magnetic field created by the steel shells of modern buildings.
By: Liat Clark, Edited by: Duncan Geere
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via Wired.co.uk
http://www.wired.co.uk/news/archive/2012-07/09/indoor-smartphone-compass-locater
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