Strava

Tried using Strava on my new phone (HTC One X) with very interesting results. Always had accurate results with my old HTC Desire, but now I'm apparently zig-zagging across London at ridiculous speeds, making Bishopsgate-Kingston 53km, and getting a KOM up New North Road at 70km/h. With a brief sideways diversion through two rows of houses.

I'm on my phone now so I can't link to the rides, can anyone tell me wagwan or whether it's fixable? Presumably a hardware issue, but does this mean my phone is forever doomed as a GPS device?

Have you tried?
http://strava-tools.raceshape.com/snap/