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APRS is a shareware program that takes advantage of the availibility of inexpensive GPS receivers to display the locations of moving stations on your PC. By connecting your PC computer to any radio network via an innexpensive ($130) radio data modem, then all stations can see the mo vements of all other stations. APRS permits any number of stations to exchange data just like voice users but without the complexity of maintaining separate point-to-point links. The primary APRS display screen is the MAP display.To help mobile units find each other, there are radio nets standardizing on several radio channels.