Just got this error when transferring flight trace to USB drive:
Flarm: Transponder receiver mode C/S/ADS-B unserviceable.
https://photos.app.goo.gl/YDjNRm995KaT9m6G8
Any ideas what does it mean? I have PowerFLARM working with LXNAV S80, FLARM and ADS-B antennas. My transponder is an old Terra TRT 250D. I don't have any ghosting issues with my transponder.
-Valentin