You can also fire up VeloViewer in a browser but it is a bit slow and you obviously need to be online.
This was mildly annoying from the ride last week:
I am pretty sure that I didn't ride a dead straight line to cut the inside of the corner but as far as VeloViewer is concerned the GPS never lies! I had actually put a spike on the GPX out into the field just to remind me to check that I was 'in' but missed it as I didn't bother with an alarm and wasn't hanging about as I was moderately sure that I was trespassing!