Thanks for a quick reply. This unit is already up to date with Software Version 5.00 installed and audio package 2.00

I have've used the mapsource to upload segmented maps which I created out of City Navigator North America NT 2011.10.gmap file & Garmin City Navigator North America NT 2012.20.gmap file.

My issue is that I have several .img files of newer maps, which mapsource don't recognize at all and can't/don't know how to install these maps anywhere.

Mapinstall software don't recognize these files either, with message indicating that it's got to be 8 character .img name(or something like that). I do have several "gmapprom.img" files and "gmapsupp.img" files, which all contain 8 characters in .img format.