The easiest way to get a sat nav is to sell your RCZ and buy a car with Sat Nav!!
Here's a cheap diesel one!
http://www.ebay.co.uk/itm/10-10-Peugeot ... 339287816d
I spent 3 years talking to dealers and reading forums to get my Peugeot 207 bluetooth kit to do audio over A2DP
In the end I decided to buy an APP 3 Pioneer Double Din after market stereo.
Despite buying all the correct expensive leads the remote never worked properly and it just didn't work as well as the factory RD4 bluetooth phone kit which is integrated into the factory screen and remote
So I decided to sell my 207 GT and buy an RCZ with RD4 and A2DP!! best decision I ever made!!
After market stereos and fitting non original stereo's in a Peugeot is not as easy as it use to be in my 1989 205 XS.
And am I the only person who likes the classic RD4 head unit?... I have a classic tomtom for sat nav!
I have never found a good factory fitted sat nav apart from Renault who just bolt a TomTom into the dash!!