Automatic Position Reporting System
APRS is an amateur radio based digital communications system for local, tactical, real-time exchange of information among all
members of a net, including map based displays for stiuational awareness. It was developed by Bob Bruninga,
, who currently works at the
United States Naval Academy.
APRS is used to transmit real-time information such as messages, bulletins, announcements and the locations of any stations
or objects via amateur packet radio protocols. Real-time reporting of station position for mobiles is facilitated using the
Global Positioning System. APRS is capable of transmitting a wide variety of data including weather reports, short text
messages, radio direction finding bearings, telemetry data, and storm forecasts. These reports can be combined with a
computer and mapping software to show the transmitted data superimposed on a variety of map displays.
In its most widely used form APRS is transported over the air using the AX.25 protocol at 1200 baud Bell 202 audio
frequency-shift keying on frequencies located in the amateur 2-meter band
An extensive digital repeater, or digipeater
provides transport for APRS packets on these frequencies. Internet gateway stations
) connect the on-air APRS network to the APRS
Internet System (APRS-IS
), which serves as
a worldwide, high-bandwidth backbone for APRS data. Stations can tap into this stream directly.
connected to the APRS-IS allow
web-based access to the data as well as more advanced data mining capabilities. A number of low-earth orbiting
satellites and the International Space Station are capable of relaying APRS data.
To see a person's position please enter the callsign: