Just an FYI. If you're on the Mac you should know that this is a really slick and easy to use app for editing, combining, freehand drawing, etc on the Mac.
It's on the Mac App Store, or directly from the dev.
Use Adze to edit GPS data like a champ
I've got no affiliation with them, but recently spent 5 minutes learning it and really enjoying it's capabilities like copying part of one GPX and pasting it onto another, merging, etc... Really easy to use.
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