Movea showed off a way to use a phone's existing sensors to calculate your position indoors, a beast of a problem for mobile devices. Typical global-positioning system (GPS) satellite data works outdoors, with a line of sight to satellites in space. Wi-Fi triangulation helps improve accuracy. Those technologies aren't as useful inside buildings where signals don't reach.
But Movea demonstrated accurate indoor navigation at the Consumer Electronics Show in Las Vegas last week. Movea's indoor navigation systems uses signals from an accelerometer, magnetometer, gyroscope, pressure sensor, Wi-Fi, GPS, and matching against known maps. The first thing Movea's mobile app does is ask you for your height. From that, it can estimate your step length. When you move, the accelerometer in your phone registers the step, and the app then figures out that you've moved. The magnetometer, used for a compass, determines which way you are facing...
http://venturebeat.com/2013/01/13/movea-calculates-your-indoor-location-with-surprisingly-few-sensors/
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