It's mandatory to wear pdf's in Vic in all waters in craft 4.5m or smaller. The same I believe is being introduced into NSW sometime next year. As for other states I have no idea.
The wearing of pdf’s here are for when you're underway which includes drifting although at anchor they can be taken off.
Some may argue that when underway {at speed} 99% of sensible boat occupants stay seated & don't be stupid. It's whilst anchored or trolling {very similar situations} when we move around, hang over the side for various reasons & would seem to make much more sense wearing them at rest {& trolling} for the above reasoning. {common sense must prevail considering conditions}
When underway & especially on rivers the only accidents {if you can call them that} are from idiots who don't stick to their own "lane" and usually on bends. Under these circumstance not a great deal survive two boats having a head on at high speed hence LJ's do bugger-all {most times}
There seems to be a lot of conjecture regarding wearing them. For example I use a manual inflating vest for comfort, freedom and various other reasons. However a manual inflating vest is of absolutely no value if the person wearing it was knocked unconcious between the boat & landing wherever. If the water doesn't refresh & wake the wearer then it would be quite apparant the wearer would be looking up or down depending on how good they've been whilst in the land of the living {drowned}.
When I purchased my vests it was bought to my attention that for those crossing sand bars wearing self inflatable or the ready to hit the water type LJ's and the boat flipped {happens & too often} that there's a REAL possibility of being trapped under the boat. Looking up or down from the never-never once again.
There are lots more fors & againsts concerning various circumstances & after thinking of as many scenarios as possible {not all mentioned] there isn't an all round life jacket on the market that will surfice in all circumstances.
Should common sense be allowed to prevail as used to be the case? I don’t know!
Should we simply use our common sense disregarding the law made by people who more than likely have never been in or near a boat & cop the $180 FINE?
Does the $180 Fine pose some interesting questions due to the fact that as far as I’m aware as mentioned there’s no ONE all round safe PDF?
Just as an added piece of info a young boaty drowned a few days ago after driving his car with boat hooked up into the water after being trapped by his AIR BAG.