I have several .img maps on the SD card in my eTrex Touch 35t. I downloaded them and moved them into the "Garmin" folder on the card on my mac. When I open Basecamp with my device connected to the computer via USB, I can see the maps and use them; however, I cannot find the maps if I'm looking for them on the device. Curiously, some of the .img maps on my SD card are viewable and useable on my device, but other aren't. If I move these maps from the card into the "Garmin" folder of the device, they show up. Is there some trick I'm missing here? Any help appreciated!