Originally Posted by DennyIndy
I'd like to understand how to prepare that GPX file on the Computer.
They have some downloadable software on their site to edit GPX files and display them in what looks like a very basic way. As for making them without riding probably draw them in GoogleEarth might be the easiest way if you don't have any other mapping program like Mapsource or Basecamp. Could use Open Street Map, too, I suppose.