APRS

APRS uses packet radio to broadcast short pieces of information — usually position, sometimes weather data, telemetry or short messages — which are repeated by digipeaters and fed into internet gateways.

It is how you see stations moving on a map, how balloon and rocket trackers report, and how a great many weather stations publish their data.

Because almost the whole continent shares one frequency, brevity matters. Beacon no more often than you need to.

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