Path Guide is an app currently available only on Android that focuses on the navigation part of indoor mapping. It makes no attempt to visualize the entire volume in which the user is traveling, but trusts other users to create “traces” to and from static locations. It uses the sensors already in the phone, from accelerometers (to count steps) to magnetometers (to sense the general area where one is starting). No need for GPS, wireless beacons or anything like that.
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