any way to edit custom maps names using Montana?

[sroof]

Hi,
   I'm having fun playing with my new Montana 600.  Is there a way to access the custom maps folder using the Montana unit so I could rename the file extension of some maps in it?  I've got several excellent custom maps (kmz format) installed from this site and a couple overlap.  Since all the custom maps can only be turned on or off as a group, I've renamed the extension of the map I don't use so often, which disables it.  It would be nice to be able to use the Montana to change the file extension back to kmz when I want to re-enable the map.

[Boyd]

No, there isn't any way to do that. Many people have asked Garmin to provide individual selection of different custom maps on the GPS but they just don't seem to be interested in implementing that feature.