"The Broadcast Area, a temporary measure pending improved surveillance capability, removes the unknown aircraft factor from the equation
Do we really see surveillance ( radar or ADSB) going in at Broome any time soon?
Even if it was possible .... where is the Cost/Benefit for that? ... as opposed to TW,AS,RK,AY,CH....?
...and the Class E transponder requirement provides an additional defence."
Note that, contrary to ICAO policy, CASA is still using TCAS as a risk mitigator... when it suits them.
And from "The Australian Airspace Policy Statement 2007" ( before Dick starts cranking up):
While collision avoidance is not part of separation provision, and collision avoidance systems such as TCAS are not included in determining the calculated level of safety required for separation provision, they are considered to be part of ATM safety management and must activate when separation mode has been compromised.
Bugger me ...