This is the short-answer companion to the deeper guides on aprs.world. If you want the long version of any of these answers, follow the link at the end of each entry to the appropriate guide. If a question you have is not on this list, the What is APRS? pillar guide and the APRS Map in Your Browser explainer between them cover almost everything a beginner asks.
APRS stands for Automatic Packet Reporting System. The name was originally Automatic Position Reporting System when Bob Bruninga (WB4APR) first published it in the late 1980s, but he later revised it to Packet because position is only one of the things APRS carries — the network also handles weather, telemetry, short text messages, and objects.
See What is APRS? for the full backstory.
To transmit on APRS, yes — you need a valid amateur radio licence in your country, because APRS runs on shared amateur VHF and HF bands.
To only look at the live map in a browser, you do not need a licence at all. Anyone can open aprs.world, aprs.fi, or any other public APRS visualizer and watch the network. We get a lot of curious visitors who are not licensed; you are welcome.
On VHF:
HF APRS runs at 10.1473 MHz USB on the 30-metre band, with a slower 300-baud modulation.
Full country-by-country detail lives in our APRS Frequencies by Country reference.
No. APRS is a digital radio protocol; GPS is one of many possible sources of the position that an APRS packet carries. Some stations beacon a GPS-derived position, some beacon a fixed home location with no GPS at all, and some beacon a Maidenhead grid square typed in by hand. APRS is about the over-the-air transport, not about the position-source technology.
The standard VHF APRS link is 1200 baud — slow by modern internet standards but plenty for short position and message packets. HF APRS runs at 300 baud. End-to-end latency from a station pressing PTT to the marker moving on a public web map is typically one to three seconds.
No. APRS works as a pure RF network and does much of its work that way — local groups, EmComm nets, and field events often run with no internet at all. The internet tier (APRS-IS) is an optional convenience layer that lets distant operators see each other and lets websites like aprs.world visualize the global feed. Your beacon will be heard on the air by anything in range with or without internet involvement.
No, and it cannot be made so. Amateur radio in nearly every jurisdiction forbids encryption (with narrow exceptions for satellite command and a few experimental authorisations). Every APRS packet is in the clear and visible to anyone who tunes in or visits any public visualizer. Treat APRS messages and beacons like a public bulletin board: do not put anything on the network that you would not put on a postcard.
An APRS passcode is a free, deterministic five-digit number calculated from your callsign. It is not a password — it is a courtesy filter that proves you can run the documented algorithm. APRS-IS uses it to gate iGate uploads and authenticated web logins.
APRS World offers a free passcode tool at /passcode, and the passcode guide explains the algorithm in full.
You need three things:
Once you beacon, your callsign should appear on aprs.world and aprs.fi within seconds.
They both consume the same APRS-IS feed; you can use either or both. The full comparison lives in our APRS Alternatives guide.
Yes. The live map, the station pages, the search, the public API at https://api.aprs.world, the guides, and the mobile app are all free to use. There is no paywall on the public visualizer. A small set of advanced features (long-term saved alerts and similar) is reserved for a Premium tier on the mobile app, but every core APRS-viewing function is free for everyone.
In order:
If you already have a handheld and want to get on the air immediately, the APRS World mobile app on Android plus a Bluetooth KISS TNC is the shortest path from zero to on-air.
Welcome to APRS. The map awaits.