Packet radio is an amateur radio technology from the early 1980s that sends data between computers. Linux has natively supported the packet radio protocol, more formally known as AX.25, since 1993. Despite its age, amateur radio operators continue to use and develop packet radio today. A Linux packet station can be used for mail, chat, and TCP/IP. It also has some unique capabilities, such as tracking the positions of nearby stations or sending short messages via the International Space Station (ISS).