What is an APRS tracker?

An APRS tracker is a device used in the amateur radio world to automatically send position data via packet radio to track the station. In Europe, the frequencies 144.800 MHz for VHF and 432.500 MHz for UHF are generally used. APRS stands for "Automatic Packet Reporting System" and is designed to convey real-time position information, weather data and other relevant communications. The tracker typically combines a GPS receiver with a radio modem to send location information to the APRS network. This information can then be received by other amateur radio friends or visualized on the Internet via APRS Internet gateways. This system is often used by radio amateurs to track the movements of vehicles or to quickly disseminate important information in emergency situations.