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.

https://itunes.apple.com/us/app/adze...99527341?mt=12

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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ADZE Lite, good, free software for editing/creating GPX tracks on Mac-screen-shot-2013-12-13-11.51.05-am.png