Episode 198: Location location location, revisited
Android Developers Backstage
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How to Measure Time With Wi-Fi Time of Flight
The wavelengths for GPS make it a little bit more consistent but they're still just like did they coat it with certain materials that are like absorbing or not. In some buildings fact the building where the GPS team or one of the GPS teams at Google works they insulated the hell out of the outside of that building and it is just it is you can't get any GPS testing in there we have to go to like one brick wall, he says.
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