Just a quick question that's been bugging me. I've bought a focus recently which requires a double Din interface and it's pushing me to buy a large screen faced stereo. Now I've seen plenty of them about which have the features I want such as A2DP Bluetooth, rear view camera connector and so on. But if I want one with sat nav the prices go too high. So can I push my Sat Nav on my iPhone to any of these devices? I've seen a JVC and Pioneer do it using specific apps, but I want to use my own choice and not the ones they allow. Any one know of such a device?