I appreciate you undoubtedly have your own reasons for doing what you're contemplating, but you won't be happy with the Saab touchscreen satnav unit unless you can get bang up to date mapping discs for it. I had mine removed precisely because it was unbelievably pointless, in that it just can't compete with the likes of TomTom etc. In short, it's old tech and it shows. I now have a Kenwood DAB unit and although it doesn't have built in satnav, it is a fantastic bit of kit. I had mine installed professionally, there was no way I was attempting a job like that myself and was worth every penny of the 70 quid it cost to have it installed.