As you probably know, you need to install maps to the device - either free or paid for. Of your 3 maps, it sounds like the OSM one is the only one that will have any useful detail (the basemap's just a vague overview of the world - very little detail at all; the digital globe is a demo of Garmin's "BirdsEye" stuff - I think it's just the Eiffel Tower). Did you add the OSM one, or was it there already? It's possible that it's not a map of the area you're in so you're just seeing the basemap.
It's worth installing Garmin's BaseCamp software (free) and connecting your Garmin to your PC - should let you see more easily what's installed and what it's for. If you do need a new map, the aukadia site has notes on getting OSM files onto your eTrex:
http://www.aukadia.net/gps/lwg_32.htm