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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].

Capabilities

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]
  • [www.findu.com] Web-based access to worldwide APRS real-time data
  • [OpenAPRS] Web-based APRS real-time data using Google Earth Maps
  • [aprs.fi] 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
  • [www.cwop.net] 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.
  • [JFindu.net] 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.qrz.ru] 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