In aircraft with limited panel space—maybe small aerobats, motorgliders or ultralights—equipping for the ADS-B mandate could be a challenge. Scotland-based Trig Avionics has that market covered with a line of compact avionics, including 1090ES ADS-B transponders. But to comply with the mandate, those transponders (and third-party ADS-B 1090ES models not equipped with internal GPS) need connection to an approved position source. The TN70 WAAS receiver is one option.
