The plan is to load topo maps from several states on my Dakota. Using a Mac. Went through MapInstall and Basecamp. First I loaded several maps on SD card. Most showed up on the Dakota, but the gmapsupp.img did not get bigger as I installed more maps. Yesterday I tried installing each topo map (with multiple tiles) separately and then renaming the gmapsupp.img files after each install. So new files are called ColoTopo.img etc. Weird thing was that all *.img files are exact same size (692.4 MB). Then looked on garmin and no new maps showed up. Same old ones were in the list. So far, I have only tried installing on the SD card. Everything looks great in Basecamp and install appears to go off without a hitch. Suggestions?
The concept of loading a map, then renaming it is correct. You obviously messed up somewhere else however and kept sending the same map file...