Sorry I guess I got confused...Did you sell your 430 and have a 430N installed, or did you keep the existing 430 you had in your truck and just add an antenna for the GPS? It sounds to me like I would have to do what you suggested.
What I would like to do is just keep the existing 430, not have to sell and buy a 430N, add an antenna, and update whatever it is i need to update then be on my way.
Thanks for your time.