If you want to buy a new vehicle with factory navigation, the
option can cost you as much as $5,000 or more! If you have a
used vehicle and want a radio upgrade. you have to buy a
standard-sized aftermarket radio, and then look for an install kit
so it will fit in your car. And there are not kits for all
vehicles. Plus then you need to buy adapters for the wiring, for
the steering wheel controls, for the bluetooth, and more.
These connectors get very expensive, and what you are left with
when you are done can look clugy and sloppy.