GPS = Global Positioning System. It uses DoD satellites to pinpoint your location on Earth to within 100 feet. Combine it with mapping software and you're never lost! Some of the rental-car companies put these things in high-end cars. You can input your destination and it will determine the route and read the directions aloud, TELLING YOU WHEN TO TURN. Very cool. Personally, I want the Alpine in-dash model that looks like a regular radio, but has the screen pop out: http://www.alpine1.com/html/De_n_138_n_n.html In the DMC-12, however, this would block the air vents. (sigh) HUD=Heads-Up Display. It's use in fighter jets, etc., where the dash info is projected into the windshield. You focus on the foreground to see your instruments, or the background to see where you're going, but in either case you got to keep your eyes forward. Probably not a great idea in a car but it sounds fun. (Maybe if the DMC ever flies...) Anyway, I'm bringing a notebook PC to Cleveland with a GPS receiver that plugs into the serial port and has mapping software. But I've never tried it before, so it should be interesting. Gus Schlachter Austin, TX VIN# 4695 > -----Original Message----- > From: kkoncelik@xxxx [mailto:kkoncelik@xxxx] > what is GPS and HUD