XPost: comp.mobile.android, sci.geo.satellite-nav   
   From: dave@davehigton.me.uk   
      
   In message    
             Wally J  wrote:   
      
   > Does anyone here have more technical information as to how Google Maps   
   > obtains your location using cell tower data   
      
   The timing of the RF burst returned by your phone gives your approximate   
   range from the cell tower.  One tower just gives a ring centred on the   
   tower; the intersections of two or more rings from other towers reduce   
   the uncertainty.   
      
   If your phone is on and able to make and receive calls, there's nothing   
   you can do to prevent gathering this information.   
      
   It can be used by emergency services to locate callers if GPS data are   
   not available.   
      
   David   
      
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