>>576113>/GARMIN/GMAPSUPP.IMGSo you use either MapManager/MapInstall, BaseCamp, MapSource, or any other number of Garmin tools to get a map loaded into the GPS.
On the 76/60's, they'll go in as "GMAPSUPP.IMG". That's what the GPS reads.
Once a mapset is installed on the unit, you can rename that GMAPSUPP to something like "Topo-Rockies". Then go back into MapInstall, squirt in Topo-WestCoast or whatever. That'll go in as GMAPSUPP.IMG. Rename, repeat with CityNav. That goes in as GMAPSUPP.
So eventually you've got a bunch of maps on the card, but the only one that's going to show on the maps on the GPS is the one named GMAPSUPP.IMG.
