All very well for the live tracker to extrapolate position, but it assumed you were passing timing points even if didn't see you, resulting in your indicated position leaping BACKWARDS several miles when you eventually did pass the next timing point.
My dear mum (who was trying to text progress progress reports to my wife & children in London) was very confused by my apparent wish to 'do another lap'.
You can replay your tracker on the website, and my progress does a couple of backwards leaps, plus a 7 mile forward leap from Putney to the finish because I had sped up for the last 20 miles.
Not the best tracking algorithm, but it has to be able to cope with route alterations and presumably a less than 100% detection of timing chips, so fair enough it makes assumptions. I think it was said elsewhere, more timing points is the only way to improve tracking accuracy.
