My navagaion system on my 2001 H&H Range Rover quit! (possibly due to the battery being disconected--that is the dealer's theory) That wouldnt be so bad if it didnt mute my radio as well. It is cost prohibitive for me to get a new Navagation system from a dealer (the dealer said I need a new Navagation system--$2200.00- no way!) Is it possible for me to get a used one and put it in my self? Can I bypass it so my radio will work? If so , how? Any help would be appreciated.