I was speaking to another Volvo owner who has a XC60 without the Sensus Nav. He asked if I knew of anyone who had paid to add Nav to their originally non-Nav equipped car? I personally do not, I did know someone with a Mercedes who did this and it was costly. He said the dealer he spoke with said it could be done IF the car had been pre-wired for Nav but was just not optioned with it. He said the dealer said that depending upon the options some cars have the supporting wiring to add Nav, so I wanted to ask here if anyone has or has known someone who has done this? He said it he was estimated around $1200 if it could be done. Sounds like a lot to me but its his wife's car and she wants an in-dash Nav. Happy wife, happy life.