Danger areas like the Moorabbin training area are marked for a reason, don't transit the area with your eyes closed and radio turned down, or avoid altogether. One thing that needs to be addressed is with all the new large flying colleges popping up CASA needs to mandate that they have prescribed training areas, away from main traffic paths and the dimensions identified on relevant maps as danger areas. Whilst the operators probably have training areas specified in their ops manuals no one else knows where these are unless marked on the map.