greg_mp wrote: Is there a real TCAS option for our small plane? I mean a device that can spot a C mode? At ~10K – yes, TAS from Garmin or Avydine (@Peter could shed some light on that – he’s got one) Or, if installing new, you could install transponder Lynx NGT-9000+ (9000+ is important detail! 9000 without the plus sign is just like GTX-345), that one has got: Mode-S ES, ADS-B IN, ADS-B OUT,...