'sailing' (as in sole means of movement) is illegal in the navigable stretch of the Yarra, a motor is required (Port Rules).
Squawk7700, by the way, has just demonstrated that he is a NIMBY (not in my backyard), this is inconsistent with piloting any aircraft since by definition, all domestic and regional airports are surrounded with NIMBY noise police vermin. This is rather sad, but given the caliber of his posts, not unexpected.
P.S. All the great cities in the world (except perhaps Tokyo) operate 24/7/365. So some parochial pr1ck doesn't like helicopter noise? Get used to it.
P.P.S An alleged pilot complaining about aircraft noise? No wonder Australian GA is in a bad way