Sydney Harbour, Navy Buoy off Rushcutters Bay. 10 January 2017.
Vessel at 33°51'42.23" S 151°14'10.85" E

Data from RAN web site, http://www.navy.gov.au/fleet/ships-boats-craft/current-ships
Class Leeuwin Class, Type Surveying Ship (AGS), Role Hydrographic survey
Pennant A 245, Home Port HMAS Cairns
Builder North Queensland Engineers & Agents, Launched 1 June 1997, Commissioned 27 May 2000
Displacement 2,205 tonnes, Length 71.2 metres, Beam 15.2 metres, Draught 4.3 metres
Performance: Speed 14 knots, Range 18,000 nautical miles
Complement Crew 46
Propulsion Machinery
4 x GEC Alsthom 6RK 215 diesel generators
2 x Alsthom electric propulsion motors
Armament
Radars STN Atlas 9600 ARPA navigation radar
Sonars
C-Tech CMAS 36/39
Atlas Fansweep multibeam echo sounder
Atlas Hydrographic Deso single beam echo sounder
Helicopters 1 x AS 350B Squirrel (not permanently embarked)