Aussie Bob:
Parachutists fall through a 1 nm wide column. 5 nm is all you need to avoid them totally, like 2.5 nm either side of where they are dropping. Struth, how hard is that?
As Andrew pointed out its quite hard and one day there will be an accident because the workload at this point is quite high for a beginner, say on their first solo navex:
Takeoff, climb, head for Brighton or Albert Park,, set cruise power, trim, transponder to 1200 or 0100 for YMEN from 3000, get Essendon ATIS, switch from YMMB 123.0 to YMEN 125.1 or Area on 135.7 watch for inbound aircraft on reciprocal course that you just heard on 123.0, , keep climbing for 2500 but not above.
Miss the jump call on the area frequency by one second in all your work.
Oh ****! What was that??? What...........
And a P.S., where in the hell is our great leader CASA in all this? How the hell could they approve it? Its terminally unsafe.