It’s hard to find good information on APRS. A web search produces mostly outdated misinformation and little of value. This is the beginning of a collection of the essential documentation.
Source https://github.com/wb2osz/aprsspec?tab=readme-ov-file
- APRS-Digipeater-Algorithm.pdf
- APRS-Digpeaters-in-Space.pdf
- APRS-Information-Services.pdf
- APRS12b.pdf
- APRS12c.pdf
- How-to-Get-Started-in-APRS.pdf
- The-Best-APRS-Presentations.pdf
- Understanding-APRS-Packets.pdf
- What-is-APRS.pdf