I am looking at installing a CHR550 in my '10 R/T w/ the 730N w/ nav. My question is this... I currently have nav but do not want to pay the fee to have them updated when I have perfectly good ones available on my iphone and ipad w/ data packages. Is it possible to run the google maps apps on the screen with the CHR550? If so, am I stuck listening to only the maps app directions or can I also run music from the phone in the background or the stock radio? Thanks for the help!