This looks interesting. Ideally this would be native functionality to the S, but I think that's a few years off. I'm a complete sucker for gadgets like this. Navdy
Ok, somebody has to be the wet blanket, may as well be me. Pilots use heads up displays because they have to. They're landing a plane full of people and need to know what's going on with a bunch of stuff they can't just look out the window and see. You don't "NEED" this. And its distracting you. So its not "SAFE", it is more dangerous to drive with this than without it. My two cents. Put the phone down and drive already.
I believe the OBD-II port in the MS is not really active and will not pass anything to the Navdy unit. It may have power. I know I didn't get any data from the port when I tried.