Gps: Now It's Really Precise

For transportation companies and other commercial users of the global positioning system (GPS), the world looks a bit sharper. Before, the Pentagon had blocked civilian use of its most precise GPS signals, limiting the accuracy of the public system to 100 yards. But consumers wanted more precision. So, private land- and satellite-based services began to offer signals accurate to the one-centimeter level. The problem was the prices were too high for the typical trucker or farmer.

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