FLARM and ADS-B and PCAS Traffic Display on PC
Another option is the use of the cellphone network to send gliders' positions to a server. Currently that's done by some via the IGCdroid app which sends the data to Glideport.aero. Either the app itself, or glideport.aero, could also be forwarding the data to OGN. This method does not require any hardware in the glider, other than smartphones which most of us carry anyway.
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