The low cost Garmin "in" unit won't work in Aus. We don't have that frequency available nor the ground stations
As I understand it the GTX345 is 1090ES transponder. Coupled with a display and presto! Receives both 978UAT and 1090ES frequencies.
The GTX 345 ADS-B Out and In transponder has a list price of $5,795
OK...what am I missing now?