I'm all most certain 3rd party doesn't get you into marinas.
My experience requires public liability.
NRMA let me roam for 3 years without any problems , I just let them know what state I was in every three months and they were happy with that . Took out the insurance when I had a mooring at Port Stephens NSW. I'm pretty sure it has to be full comp as well , it's not that expensive if you don't insure your rig .
