Automatic Position Reporting System (APRS)
A special mode of Packet Radio is APRS (Automatic Position Reporting System). This allows to transmit the actual position of cars, boats, airplanes, and other objects. An APRS System is composed of:
- a computer or special interface
- a TNC (Terminal Node Controller)
- a transmitter with GPS data
The actual position is transmitted regularly by radio to a digipeater and the receiver displays the data on a geographical map.