On my Montana unit I am using custom maps for an archaeological survey.
I have several maps of one area, each containing different data.
Is there a way to choose a particular map for display, and suppress the others?

To my knowledge the only (obvious) way to do this is attaching the Montana to a computer, and renaming
the .kmz files (or the folder Custom Maps) as needed. But in the field this is not possible.

Is there a way to rename files or folders on the Garmin unit itself?