Clunker

See, I think this one is a miss. If the previous owner hadNav (European for GPS) then he wouldn't have trashed the car. So wither the Sat Nav

The more important thing here is to note that the European "GPS" is now fully operational and it is cheaper to use and more accurate than the US version. But that's OK because, after fighting about it for years, the European and US GNSS community all agreed to let two systems be compatible and work together.

That's right, I said GNSS. So now it's time for a few more glossary terms. "GNSS" = Global Navigation Satellite System and can be applied to any such system. "GPS" = "Global Positioning Satellite or System" and should only refer to the US system. The European system, by the way, is called "Galileo" (since it became fully operational in the 400th anniversary of Mr. Galilei's earth-shattering telescopic activities.
been using the Sat doesn't work, or the sleazy car salesman is speaking sarcastically, which makes him terrifically bad at his job.