No one. Class C is not around minor airports. Class C in the US requires a full terminal primary and secondary radar service and they are BIG airports by Australian standards. Many equivalent to Brisbane or Sydney.
How does it improve situational awareness when hardly anyone has an installed ADSB " IN" unit.
Peter ; And why do we need improved situational awareness? What is the risk that is being adressed for the $30 million plus bill for GA.? How can we be a leading place in the world when Airservices have installed hardly any ground stations?
No one. An IFR pilot will be able to operate to hundreds of class D and E airports across the USA without the cost of ADSB. Even be able to operate a full IFR flying school from a class D tower airport complete with dual ILSs and then do multiple approaches and training to class E approach airports with no expensive ADSB fitment.