This may already have been asked but, I would like to use my phone to track my bike rides but the latest tracker I have used managed to say I did 20 miles in 20 mins. Now that doesn't sound too bad but it was on my bicycle and if my maths is right it reckons I manged an average speed of 60mph!

Any ideas guys?

Ps I'm on Vodafone in the uk if that helps!

ty in advance