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Each year, as they pay their taxes, many Americans conduct a tiny mental debate. "Why should I have to turn over such a huge fraction of my hard-earned money to the government?" And then, a moment later: "Oh, yeah: schools, roads, national security - blah, blah, blah. Sign the check."But the government goody most likely to make a gadget freak giddy is the Global Positioning System, or G.P.S. It's a constellation of 24 satellites that beam down navigation signals for the benefit of hikers, bikers, campers, sailors and drivers. Down here on earth, a G.P.S. receiver can analyze these signals to tell you precisely where on earth you are, accurate to within about 10 feet. When teamed up with a computer, a G.P.S. receiver can then display your location on a map, provide directions to a destination, and so on.
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