I want to run 20K. However, when running I have my iPhone on random play and when, let's say, Offspring comes on, I run faster with longer strides than if I am listening to Elvis Costello. So if I use a standard pedometer to measure my 20K it would be quite off. Is there any app on the iPhone that could use the GPS to tell me how far I have travelled? So I mark a start point, let the GPS follow me and tell me how far I have run from that start point?
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