Complex network of satellites that transmit signals to ground receviers in cars, boats, airplanes (see also VOR). The GPS receiver uses the signals from the satellites (which are over 15,000 miles away!) and uses them to find your location, anywhere in the world, with incredable accuracy.
Without GPS, countless losers who can't use a VOR would be lost"
The term "hazardmobile" generally refers to a small reddish domestic car (Ford) driven by a crazy irishman (who goes to Fairfax High School). The hazardmobile (OR hazard mobile) usally has a small amber (or yellow) light on the roof of the car. It also has a VHF-FM two-way radio installed in it. Because the irishman is crazy, the car also has a manual tranmission in it and an incredibly small engine.
See the red car with the yellow police flasher on the roof and the large antenna on the trunk. Yup. That's the hazardmobile.