Fleet sister, not a true sistership. Tucana is a fairly unique looking (read: Ugly) tug, she was designed to push a barge actually but the design wasnt that favorable afterwards (or so I'm told). She might even be one of a kind. Draco and Orion are old single screw docking tugs. Question: The Shannon, in the same Constellation livery doesnt happen to be down by you, does it? I've lost track of her...