Jabby
Now I have undone the wing nuts and come out of the asiatic closet, you may take over the humour baton from Creamie and me
Back on ADS-B there's really only three I believe. VDL 4, 1090ES, and UAT. Australia is unlikely to sustain UAT and why run two systems anyway. Don't know anything of VDL 4 but do know 1090ES is going well according to the two recent ATC contributions.
So what's our options. And, if we don't go with the subsidy is the risk we do go later - with user pays?