Ride with GPS is offering map updates for Garmin units for $25. That is much cheaper than Garmin charges, however, the map data is using Open Street Maps (OSM) data which you can download to Garmin units for free. This website offers info on how to do download OSM data and put it on your GPS unit. At home, I have links to a very concise webpage with very easy to follow directions. I will update this posting with that info soon. Thew data on my Garmin Oregon 300 (from about 2005) works fine with it and can even follow the roads and trails for driving/riding directions.