XPost: comp.mobile.android, alt.home.repair   
   From: rragnusen@ultred.com   
      
   Am Sat, 31 Mar 2018 15:57:02 +0100, schrieb Andy Burns:   
      
   >> The problem here is there is no cellular data possible, and you're driving   
   >> along the road so you're not likely to be connecting to access points that   
   >> you don't even know - but certainly you can 'see' them.   
   >   
   > Did it know where it was, at the time?  Or maybe it stored the visible   
   > access points and then pieced the location together after the fact, once   
   > you got back home and connected back to your own wifi?   
      
   Hi Andy,   
   I think you're on to something, because in the accidental test I had run, I   
   was at the local library where I was on the Internet, so, yes, Google Maps   
   /knew/ that one spot perfectly well, because the tablet was on the   
   Internet.   
      
   But then, I drove.   
      
   Looking down at the tablet on the passenger seat, I was shocked to see the   
   blue dot move, along where I was, but in fitful jumps. Huh?   
      
   Then I pulled over, and did a "route' back to the library, and lo and   
   behold, Google Maps, completely offline, showed that route. Huh?   
      
   It not only showed the route, but it showed the blue dot which, roughly,   
   was where I was driving (which was in the opposite direction from the   
   library since I was going home).   
      
   Since I live in remote mountains, at one point, the blue dot just locked in   
   place in the area of a little village, and it stopped moving.   
      
   So, I /think/ it's using WiFi (and not Bluetooth) but I don't know how it   
   could do that /unless/ Google Maps stores the BSSID:Location pair for all   
   access points in the offline Google Map.   
      
   The only other possibility I can think of is that every once in a while the   
   tablet connected to a wide-open (aka unsecured) AP, and in that fleeting   
   moment, Google Maps accessed the Internet to determine the location of that   
   connected AP. But that seems far fetched, does it not?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)