after weeks of trying and failing I finally managed to create a working map out from the data which the Norwegian Polar Institut provides.
I have formatted the maps so now I am having small KMZ files which I can use on the GPS unit and which I can upload in to Basecamp.
Now I need one of you experts how can we make a installer setup for it (I want this map to be shown as map in Basecamp - on the top menu)
just to keep the workspace on the left with all the routes and points a bit more clear so working is easier.
Looking forward to your feedback and yes off course I will share the data with you.