Stolen from Aberdeen Bikers.

For all those out there using Garmin Sat-Navs on their bikes (Zumo etc.) then the GMapToGPX utility is an excellent tool for planning your routes using Google maps - http://www.elsewhere.org/journal/gmaptogpx/

Bookmark the link in the instructions then go to Google Maps and design your route. When you click on the GMapToGPX book mark it will display a load of text which you then copy into Notepad and save as a .gpx file. If you have a Zumo then copy that file to a flash card and plug it into the bottom of the Zumo. Next time you switch the zumo on it will detect the route so follow the instructions to import it.

EH???

Bet it's simple really. Is it a better route planner than the CD that comes with the Zumo? Has to be at simpleton level obviously.