Well in that vein you'd be better off with a Galaxy S3 running Google Maps
I still like the RNS510 since the maps are only a button press away, no major map incorrections in my area, and easy destination entry via voice control (also have latest Bluetooth installed). Plus DVD player and HDD for supporting music appealed to me, so don't quite the unit off too quickly, but to each their own.
You can't order a car with RVC without having the RCD510 or RNS510 otherwise there's no screen to display the camera feed. If you already have RVC and RCD510 then there's no reason why you can't upgrade to the RNS510.
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