Ok, not trying to get too controversial (not saying I want the service for free, but maybe discounted... or free) but I am contemplating adding the NAV to my 8.4 uconnect in my 2017 bighorn eco. I was watching a YouTube video and a dude said that he had his done online with a radio repair shop...
Interesting article here:
The solution is to set a location in the NAV menu, and then mute the radio. Oddly enough, uses have been having success with this.