I just got my first GPS (Garmin 605 Edge) and I'm super excited to get it up and running to full capability. I took it on a ride yesterday and the map it came installed with totally sucks. I wasn't aware that I needed to download a map for it for that feature to really work well - I know...how could I NOT know that!?

Anywho, I'd like to avoid purchasing a map for it and find a way to download something that will work for me. At this time I just want to be able to get something that displays roads around here in the Denver area. I can always expand on it later if need be.

Anyone know anything about this that can guide me or give me some tips. I've been browsing around online, but honestly I'm kind of confused at this point.

Help?