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On old analog phones in North Dakota one winter they used tower signal strength estimation to locate a stranded person down to the nearest 1/2km and determined she had turned on a farm road. Also a good lesson learned on why you keep batteries charged, as she ran out of battery just as they got a basic location fix. Now you can get an App aimed at helping ID your location for emergency services

http://ca.news.yahoo.com/app-designed-north-dakota-blizzard-aims-help-drivers-165127237.html