Yeah pretty sure thats whats going to happen. I have nav so I get nav as a purchased option one time, then an add on over the air 3rd party subscription for added map features.On the UConnect System FCA uses the navigation is a one time purchase. The subscription is the SiriusXM Guardian and Travel Link programs. Guardian is the “onstar” type services and travel link is weather alerts and gas prices and movie showings/times etc.
I’m going to bet that the Sync “NAV subscription” will be very similar with the addition of the offline/off-road mode also behind the subscription pay-wall. In other words, I’d wager pretty hard that the basic NAV will work without any recurring subscription.