For what it's worth, my own experience of transiting YMAV was at about A2500 on a coastal round the Bay jaunt.
The zone was not active, but Jetstar was inbound and there was a call from Melbourne radar to "the VFR aircraft at 2500 near Avalon" from what I can remember.
I piped up and announced myself to the South, tracking to Clifton Springs and just over Point Henry or suchlike.
Mel Radar then came back asking for a range and bearing from YMAV, explaining that their radar display didn't "know" where Clifton Springs, Leopold, Point Henry, etc. actually "were". I suspect a Tower at YMAV would know these things.
Anyway I'm out of my depth in this discussion.