Curious what the consensus is here. I have a Montana 700i with a 32 Gb SD card installed. I wanted to move City Navigator maps to the SD card (using Garmin Express_Manage Maps) to make more room in internal storage.
I did move the maps and everything seemed fine; however, Garmin Express crashed every time I tried to use the Removable Storage tab under the Manage Maps option.
I posted in the Garmin Apps & Software forum and opened a Support ticket. Both avenues resulted in me being told that I should not be moving anything unless Express told me explicitly that there was not enough room in internal storage.
I see references here to maps being moved so it seems my idea was not an unusual one. I think the Montana accepted the move okay and that CN maps still worked. There is some overhead though because when an update comes Garmin Express plunks it down in internal storage even if CN is installed in removable storage.