In the 10 years since President Clinton ordered the military to unscramble the GPS signal, the big benefit has been to increase accuracy from about 100 yards to just a few feet. It makes navigation devices more accurate. Before, when civilians got what was called selective availability, GPS knew more or less if you were on the highway; now it knows if you're centered in your lane. It's still not good enough for autonomous driving. But there are other benefits we'll see before we see self-driving cars:
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