Your mapsource, once selected the map tiles you want to transfer, will build just one .img and will send it to your gps or, if your MS is patched, to any drive.
If the map is an update of your previous one, backup it along its .unl file and .gma ,delete them from gps , send the new .img to C: ,unlock it with Fast Img Unlocker then copy it to your gps. Concerning the name, it depends on units and if you want to send to sd or internal mem.
If it is an update, rename it exactly like the old one you want to replace in gps.
To understand a bit more about what is contained in your gps, look at your .imgs with Gmaptool
[Only registered and activated users can see links. ]
Drag&drop in it the .imgs ,it will show a log with all the needed infos.



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