Something similar happened one time in Blackwattle Bay in Sydney
Hbr. to some Canadian friends of ours. They were asleep, and woken by noise
in the cockpit
. A party of four had swam over to drink some more on the boat. No concept
that it might have been occupied. Our friends appeared, starkers, and moved to detain the intruders. The intruders leapt into the water
and swam ashore, one of them minus the jacket he had been wearing, that stayed in our friend's hand. They also left 2 6 packs of beer
and a bottle of Galliano.
Your boat may be your home, or your toy, but to others, it is merely an object, even if it is one that might contain stealable *stuff*.
Fwiw, boardings for the purpose of theft-for-sale take place more often in the months leading up to Christmas
, in some locations, or so we were told by an Australian LEO.