Without it, ATMs would stop spitting out cash, Wall Street could blunder billions of dollars in stock trades and clueless drivers would get lost. It's GPS, and it's everywhere. Although most people may associate the Global Positioning System with the navigation devices that are becoming standard equipment on new cars, GPS has become a nerve center for the 21st century rivaling the Internet — enabling cargo companies to track shipments, guiding firefighters to hot spots and even helping people find lost dogs. "It's a ubiquitous utility that everybody takes for granted now," said Bradford W. Parkinson. He should know. Three...
