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I had this thought. Do any of the “driving directions” places, like the AA or MSN MapPoint or Multimap allow you to input GPS waypoints? Alternatively, is there anything on the net which translates GPS waypoints into postcodes? If there is, then if you can pipe a net connection into your car somehow (GPRS is the obvious solution here) then you’ve got satellite navigation, because you just keep fishing your current location out of GPS and then query the site for how to get to where you’re going.
Of course, it’d cost a fortune in connectivity bills, and you’d be better off just buying a real satnav system for four hundred quid or so, but that’s not the point.