I started home from work today in my Acura MDX and hit my normal GPS buttons to calculate the distance. When you put the car in reverse the GPS screen becomes a video screen for a rear point camera that gives you a view of what's behind the car.
Normally when you put the car in drive, the map for the GPS pops up. Tonight I got a merger between the GPS screen and the rear camera screen. It actually was pretty neat. I could see cars approaching from the rear, I'll check to see how it behaves tomorrow. The good news is that it is still under warranty.