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Automatic Packet Reporting System (APRS) is an amateur radio based system for real time data communication of location reporting and messaging.
More info at:
I use APRSDroid on my Android phone which is a great tool for reporting my location, speed and altitude to ARPS.FI I normally use APRS when mobile in the car, on the bike or walking.
I also operate a APRS I-Gate which runs on a Raspberry PI B+ with a SDR dongle. This allows for a compact 24/7 local or portable setup.
I used to have my WX (Weather) Station on APRS but currently my Weather Station is broken.
You can see my nodes on this map view of Bristol via aprs.fi or via the below embedded map: