Automatic Packet Reporting System (APRS) is an amateur radio based system for real time data communication of location reporting and messaging.
More info at : APRS.FI & APRS.ORG & APRSDROID.ORG
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 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.
Below is a live map of my APRS weather & QTH beacons: