i saw this thread and thought it would be fun to test. I'm in Bordeaux France for work. I did use gps there but not for a couple days now. I hope on TGV to paris. Half way through i remember about this thread and fired up Drive, put phone to window and about one minute, i get lock and i'm cruising at 298km/hr

that said, the phone seems to have trouble keeping accurate velocity at that speed

maps is offline mode cause of data cost.