I'm in the same boat. I bought early in May and all the information at the time pointed toward being able to activate the navigation later on down the road like the 4th gens. I will swap it out at some point, probably with the 12" screen since the cost will be pretty close either way.I’m very thorough (at least I thought) and feel like I dropped the ball on this cheap *** radio! NO HD, NAV, remote features, etc. Very unhappy.