I could (possibly) work this out myself, but I’ll try you lot instead: anyone know how to combine two GPS tracks onto one map? I mean tracks as stored on Garmin’s website, and displayed like http://connect.garmin.com/activity/127111491. Specifically, I’d like to combine that track with this one. The tracks are both public, so you don’t have to assume any authentication is needed.
Update: thanks for the advice. In the end I didn’t bother with any of the fancy software and just used vim which did a perfectly good job of sticking two GPS files together.
It would be nice to colour the tracks separately but I’ll live without. I’d still like to be able to do this on-the-fly, but again life is too short.
The answer is: Tidy steered a better course than me :-(.