Does anyone know if there is a way to install an after-market rear fisheye camera that will display on the NAV screen so you can see what is behind you while backing up? My wife's Honda Odyssey has NAV with this feature, and it is a great safety feature.

With $$$$ Limitations are few.

REAR VIEW CAMERA

You would probably need a technician to do the wiring and install.
Unless you are an avid DIYer