I have all of europe on a disc that came with my garmin. Does not have to have the card slot, but worth having. You can just plot your routes using , I think any site, and download it to the directly to the Garmin. You can use opencyclemap and save to the garmin. I would save as a GPX file to Mapsource which comes with the Garmin and download from there. I use Bikeroute toaster but you can create your routes in Mapsource. It's IMO not hard. I am sure there are lots of members on here and other sites [type Garmin Legend into this one,
http://cycleseven.org] using the Legend with more knowledge than me. I've used mine in France, germany, Austria, Czech Rep. Would not be without it.