Sorry for bringing this thread back up, but I thought I'd share my experiences (and fix) with map v6.65.
TomTom recommended I upgrade to Navigator 7.9.x.x when I plugged my phone into my laptop. I installed this, and my map could no longer be found, despite working properly in Navigator 6. Since I read on here that 6.75 map worked great for people, I played around a bit with the files. Here is the solution that worked for me to get map v6.5 to work with Navigator 7.9.x.x:
Navigate to the directory that has your map. For me, this was \Storage Card\USA_and_Canada. Open USA_and_Canada.pna with a text editor, and you should see something similar to the following:
Code:
ID=USA_and_Canada.pna
147037397
665
build=1293
id=64682
Change the 665 to 675 and save it. Open up TomTom Navigator, and you should now have the option to select your map. Hope this helps!