Car: MX-5, C6 Vette & MB S212
Join Date: 3rd June 2007
Location: Where Polar Bears roam the streets
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Yes, a NS says, in THEORY it is possible, but it is a big job that needs lots of expensive parts.
Unless you can get ALL the parts you need from a scraped car and do all the work yourself then it is probably cheaper to trade the car in for another one with sat nav.
T-grade satnav may be possible though, don't know anyone who has done that though.
Or - go for a double din conversion selecting a double din unit with sat nav.