The need for a GPS cell phone? Picture driving an unfamiliar highway and witnessing a small red car careening off the road into a ravine. You pull off the highway and with your heart pounding you get out of your car to find the red Chevy about 80 feet below - upside down. You realize someone may be hurt badly. Fortunately you have a cell phone, as many people do. You call 911 but you don't know where you are other than on Route 95 about an hour north of Needles in the deserts of Nevada...
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Fortunately, the U. S. FCC (Federal Communications Commission) has mandated a program called E911. E(nhanced) 911 requires the location of any cell phone used to call 911 can be determined to within 50 to 100 meters. The law took effect at the start of 2005. That means cell phone manufacturers have incorporated a GPS receiver in virtually every cell phone. A side benefit of this law is now we have the combination of a cell phone and GPS which is good for two additional uses: 1) driving directions in your automobile and; 2) the ability to use a cell phone as a handheld GPS for out-of-car purposes.
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