A fast planing launch, currently in MOSS Survey (but on hold with MNZ till 2022).  Seating arrangements can be easily configured for either sightseeing passengers or divers. No berths, but a practical galley. Powered by two Suzuki outboard petrol engines providing a total of 600hp and a speed of 18-21 cruising and maximum of 25.  If a commercial operation the petrol tax rebate brings the cost of fuel down to almost equal to diesel, and with the lighter motors saving overall weight, there’s better all round efficiency.
Mooring negotiable. Price plus GST if any.

NB: Would make a great viewing platform for the America’s Cup and then a fishing charter afterwards.