Mr Phew, Flying Binghi, and Peuce
One must question about this risk and how genuine is the concern.
In case of genuine concern aircraft should have fitted TCAS, as has Mr Binghi, if traffic in West Australia is of risk. In my read of Avalon Study I find Sharp do not use TCAS - is this common for small operators?
By reading past and present Airservices study of Unicom and NAS I find noone wants to pay for Unicom as mitigation. And, facts of analysis also from NAS PIR and Airservices studies read that problems are shared in cause by all users and particularly poor procedure on radio and in circuit.
Much talk until money required.
This leads to Peuce point. Services where warranted. In ICAO Aisrapce G class what services warranted? Is it not to the users to supplement system in Class G?
To my reading, ADS-B may be good mitigator in West Australia.