Only about 60-65 % of the aircraft detected by ADS-B reveal their position. The ones that don't are military and private aircraft - business jets, small single-engined turboprops, and old aircraft lacking a GPS belonging to dubious airline companies. You probably came across the term 'MLAT' or 'multilateration' - a triangulation technique that can reveal the position of these aircraft. It requires a special setup (precise timing) of the ADS-B decoder software and a community of MLAT sharers. It might be a good idea to devote an HAK5 episode to this subject? Late March POTUS and his flying cir