Create your own maps with cGPSMapper

cGPSMapper allows you to create your own maps for Garmin GPS devices. Many programs expect you to have cGPSMapper installed to be able to use them. Therefore it makes sense to install it even though you don't want to create your own maps (yet). You can download it for free, just the professional version (which allows you to creat routable maps and includes many more features) costs between 30 and 2800 US$.