1. Afaik all the maps generated with Basecamp/Mapinstall or Mapsource are different from those original gmapprom.img's that could be downloaded from Garmin while updating with WebUpdater. Since i have no license to the map i always expect somebody to upload the original image. But alas as a rule - in vain.
2. It's impossible for me to install and run such programs as Basecamp/Mapinstall or Mapsource (no explanation followed, but usually i can download (thanks to Mighty All) the image files, as they outcame from BC/MI or MS. But very seldom - original gmapprom.img.
My requests to ul the original image file were ignored as a rule. To a pity.
This is my point of view to the subject (the way sbog sees it).
In fact i'm interested in the maps for 3790 (namely CNE NTU), but it occurs to be more convenient to make such a "speech" here.