Sorry, I didn't explain myself well, because of my poor english.
--> I aim to have many selectable boxes, 1 for each img, but I can't!
My Zumo500 works this way:
-when I merge many img-map-files (coming from the same Garmin map version) in 1 img-map-file using Gmaptool, I obtain only 1 selectable box.
-if I put many img-map-files (coming from the same Garmin map version) in internal device memory naming them with different names such as gmapprom.img, gmapsupp.img, gmapsup2.img and even another gmapsupp.img in SD, I obtain only 1 selectable box as above.
-I can obtain separate selectable boxes ONLY if img-map-files are coming from different versions of Garmin maps.
I guess if it's possible to change file attributes using Gmaptool to simulate that a file is coming from a different Garmin map version.........