• Go to first post in this thread.
  • Scroll down to 'Using GMapTool'
  • Click the 2nd hyperlink 'How to merge Garmin maps with Gmaptool'.

Ensure the resultant joined image does not exceed the image file size or map tile limit of your unit. Best to enable the individual maps only one at a time on the device when they cover the same area. If your unit can use more than just the one image name gmapsupp.img, better to just use separate image files for your maps.