How can I merge two GPX files into one?
GPX files are XML files, which means you can edit them in a text editor. I use Notepad++ on Windows and TextWrangler on OSX, but you should be able to use the built-in Notepad or TextEdit. Don't use a word processor like Word or OpenOffice.


Open the second GPX file in a text editor. Copy all the stuff between &lt;trk&gt; and &lt;/trk&gt; inclusive.
Open the first GPX file in a text editor. Paste the copied stuff after the &lt;/trk&gt; line near the end of the first file and save.
If you have more files, repeat.