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Probably possible, but expensive and technically difficult. Many have asked, but I've yet to hear of anybody going ahead and trying it. Besides, the functionality on a 100 quid portable sat-nav will wipe the floor with the original Renault system.
If you value the factory fit look above all else, then it might just be worth looking into. If you want a decent, working sat-nav, then get yourself a portable unit.
If your car has the heat reflective windscreen, then make sure you get a receiver that uses the SirfStar III chipset. The newer TomTom units all do, as do some other manufacturers' later units. If you go for something with SirfStar II or other chipsets (e.g. TomTom Classic, 300, 500, 700) you'll end up having to spend another 50 quid or so on an external antenna.
Currently in Horatio's garage:
2010 Laguna III Initiale.