Hi there! I have this 2007 Honda Goldwing motorcycle with a built in Navigation system made by Garmin using a gmapsupp image file inside a CF card. I want to upgrade it with a newer unlock image file via my computer but it's not working because the size exceed 2 GB.

So, I would like to know how to edit the file, remove some states and countries to make it under a 2 GB gmapsupp image file. I’ved tried with Basecamp, Mapsource, Mapedit, gMap tool etc. Without success.
Help please!