I suspect it might be more useful tying this to accelerometer data form my phone etc. I will get the code into some decent shape over next few lunchtimes and se

I suspect it might be more useful tying this to accelerometer data form my phone etc. I will get the code into some decent shape over next few lunchtimes and see how to get historic accelerometer data / location data - it must be feasible somehow. However I suspect that Apple already has 50 people working on it