I'm planning to use a sd card, but haven't explored that with this 'new to me' gps unit. I do have OSM, but for some areas (Guatemala for one) there is not much mapping beyond the main roads, when comparing to google earth or other on line sites. Mapping will be severely limited as it seems that very old unit only has 24Mb max. It will be able to send some routes and tracks to your Garmin gpsmap 60. You could use Mapsource and install OSM maps into it on your computer. I also need to load maps to my Garmin 60, although OSM is one option. My ideal goal is to have something like Google Earth available on my computer without wifi, be able to use it on my computer for routing, and then transfer routes to my gps. I do like to use Google Earth, but without wifi, GE is not an option. I'd like to have a computer based mapping method that doesn't require wifi like Google Earth, then load tracks to my gps.

Not sure if the Expert GPS map set is better than OSM. I have used OSM in Mexico, but I know it has limited detail in certain areas, like Guatemala rural areas for one. Download Guatemala Map Software for Your GPS I can't figure out if their maps are detailed in the more remote areas, more remote roads/trails. They appear to have a good map set available, and the map sets can be uploaded to your gps. Has anyone used Expert GPS Home to upload maps and create tracks for Central America travel? ExpertGPS - GPS Mapping Software for Garmin, Magellan, Lowrance, Eagle GPS

Expert gps maps