Ardupilot have an add-on transponder solution that should be compliant in some configurations, although the whole thing is a complete mess in terms of certifica

Ardupilot have an add-on transponder solution that should be compliant in some configurations, although the whole thing is a complete mess in terms of certification and the MOC documentation as there's a lot of uncertainty around the tamper-proofing requirements. You should be able to get your old fixed-wing builds updated. https://dronescout.co/dronebeacon-mavlink-remote-id-transponder/ https://dronescout.co/dronebeacon-mavlink-remote-id-transpon... https://ardupilot.org/dev/docs/opendroneid.html#opendroneid https://ardupilot.org/dev/docs/opendroneid.html#opendroneid I'm waiting to care until the deadline actually approaches.