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RE: A free lunch with Edward Snowden
I was travelling through Europe for a few months without cell phone service. I remember being in Venice with no service at all, yet Google Maps still had a blue dot that knew exactly where I was.
Well. That's call Offline map browsing. The blue dot works because the gps signal is working without internet.
And the second point they know the koordinates of some wirelesshotspots and with that information google-maps can make some triangular-calc's even when your not connected with those spots.