Main Page

From APRSWiki
Jump to: navigation, search


Automatic Packet Reporting System

Originally known as "Automatic Position Reporting System" but renamed by its creator, APRS is an amateur radio based digital communications system for local, regional, or long-distance (as in the case of HF APRS) tactical, real-time exchange of information among all members of a net, including map based displays for situational awareness. It was developed by Bob Bruninga (WB4APR), who currently works at the United States Naval Academy. He maintains the main [APRS web page].


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.

Technical Information

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 (see Frequencies). An extensive digital repeater, or digipeater network provides transport for APRS packets on these frequencies. Internet gateway stations (IGates) 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. Databases connected to the APRS-IS allow web-based access to the data as well as more advanced data mining capabilities. A number of LEOs (low-earth orbiting satellites) and the International Space Station are also capable of relaying APRS data.

External links

  • [WB4APR web site]
  • [] Web-based access to worldwide APRS real-time data
  • [OpenAPRS] Web-based APRS real-time data using Google Earth Maps
  • [] Web-based APRS view using Google Maps and Earth, updates automatically in real-time, 14 languages
  • [APRS Specification] Official APRS specification document
  • [Pacific Northwest APRS Homepage]
  • [APRS Query Page] N1BQ's HTML Forms based front end to the FINDU database
  • [] APRSWXNET/Citizen Weather Observer Program (CWOP)
  • [JavAPRSSrvr Yahoo Group] This group is for users of the APRS-IS server software, javAPRSSrvr.
  • [UIDigi Yahoo Group] A replacement for TNC2 firmware to upgrade older TNC's to APRS.
  • [] Web-based access to worldwide APRS real-time data.
  • [APRS Search] An APRS Search Engine.
  • [DB0ANF] APRS-IS Data Base Lookup Server shows individual stats on any given call sign.
  • [Tier 2 Network] Tier 2 APRS-IS Servers Group
  • [LU-APRS] APRS Argentina Forum (Spanish)
  • [APRS Middle East] Middle Eastern APRS Web Site, Currently Lebanon only
  • [ZLHAMS Wiki] includes New Zealand APRS wiki pages
  • [OhioAPRS] Northeast Ohio APRS
  • [Emergency Beacons] Help those that need help, even those that test.
  • [APRSfl] Details & Stats on West Central Florida APRS, UI-View Webserver Lookups, our Tier 2 APRS-IS Server.
  • [JAPRSX] JapanAPRSeXperiment, Web & BBS for Beginners.(Japanese)
  • [] APRS in Russia
  • [SARTrack] SARTrack - Originally designed for a SAR group in New Zealand, now available for the Amateur Radio (HAM) community, and SAR groups in other parts of the world.
  • [Aprx] Open source Linux digipeater/I-gate daemon