Amateur Radio Stations heard via Satellite

This site captures downlink packets from the APRS enabled unmanned satellites.

About this site

This page shows real-time information collected from the Automatic Position Reporting System Internet network (APRS-IS).

The communication statistics that we show here may differ from similar communication statistics on other websites, the reason is that we are not collecting packets from the same APRS-IS servers. Each APRS-IS server performes duplicate filtering, and which packet that is considered to be a duplicate may differ depending on which APRS-IS server you receive your data from.
To include all duplicate packets in our statistics we would need a duplicate feed from all APRS-IS servers in the world (that would be hundreds of servers). The APRS website collects it's packets from our own APRS-IS server, which is connected to a APRS-IS core server.
Please note that if distance is very long it may be incorrect (not all digis add themselves correctly to the path).

Automatic Packet Reporting System (APRS) is an amateur radio-based system for real time digital communications of information of immediate value in the local area. Data can include object Global Positioning System (GPS) coordinates, weather station telemetry, text messages, announcements, queries, and other telemetry. APRS data can be displayed on a map, which can show stations, objects, tracks of moving objects, weather stations, search and rescue data, and direction finding data.

APRS contains a number of packet types, including position/object/item, status, messages, queries, weather reports and telemetry. The position/object/item packets contain the latitude and longitude, and a symbol to be displayed on the map, and have many optional fields for altitude, course, speed, radiated power, antenna height above average terrain, antenna gain, and voice operating frequency. Positions of fixed stations are configured in the APRS software. Moving stations (portable or mobile) automatically derive their position information from a GPS receiver connected to the APRS equipment.

Terms Of Service (TOS)

  1. The service is provided free of charge, as a public service, by a single individual, as his hobby.
  2. The service may or may not be available at any time. The availability is generally very good, but there are no guarantees.
  3. is not open source software. It is copyrighted. Learn from it, do not steal it. Some specific are separately published as open source.
  4. You are not allowed to "frame in" content from the service.
  5. The sole purpose of this site is to publish real-time and historical position tracking data. Such data is considered sensitive and private by many. If you do not wish to make your position known to everyone in the world, do not transmit it on the Internet or using APRS. If it gets to using the APRS-IS or other means, it will be published and retained on the service.
  6. If it breaks, you get to keep both pieces. No refunds.

Amateur radio transmissions are defined to be in the public domain, by international regulations). Anyone can receive them, and retransmit, publish or store them as they wish. If you do not wish your position to be published on the Internet by someone, the only guaranteed way is not to transmit it.

Credits and thanks

Contact us