Put the camera on for a session at Silverstone yesterday if anyone was there in the fast group and spots themselves
I run a virb mate but I stopped using the inbuilt GPS for speed - if you watch the speed numbers you'll notice that they don't match the footage very well. Mine had exactly the same problem so I tried a few different GPS units and now just import more accurate speed data to overlay on the video, depends if it bothers you as much as it did me! Love that track!
Yeah, the speedo on it's a bit crap. The lean angle sensor is similarly rubbish too. Good camera though, and records a nice clear image whilst taking a lot of the vibration out