APRS (Amateur Packet Reporting System) is a twenty-something year-old packet radio network run by amateur (ham) radio operators all over the world. Anyone with a ham license can join the network and use it to report their position, frequency in use, telemeter data from remote sites, send text messages and more. Historically, the gear needed to get on the network was either hundreds or thousands of dollars to buy, or home-brewed and unreliable. This talk will teach you how to use APRS in a wide variety of ways, while spending only tens of dollars. In fact, you might already have everything you need and not know it!