(please remove if this is inappropriate but...) I presume you can just burn a copy of a satnav disc. My car has what appears to be a CDR in it and the nav works fine. Properly up to date according to the label at 2011!
Now, the SatNav is **** compared to what you're likely used to, but I was actually kinda impressed, once I'd defused the 'defaults to Italian' issue. The voice is clear and direct, the map is easy to read at a glimpse, the lack of touchscreen... hmm yeah.
Though it does reveal some interesting insight into the way of thinking back then. I like the way that when you search, it limits the letters of the alphabet based on the available results for example. I doubt it'd replace my (old with way points) TomTom, but I've been on a couple of runs where I've been happy to try that road which looks fun and twisty on the basis that I know it'll get me home