Crane for Lifting Boats?

Cee’s Black & White Challenge this week asks for only one, two or three wheels on display, so instead of going for a moving vehicle I’ve chosen this image of a crane that is maybe used for lifting boats out of the water? It sits on the quayside next to multiple leisure boat moorings, quietly doing its own thing. Anyway, whatever it is used for, luckily for me there are three wheels showing on this wheel-and-pulley system so it seemed to be the perfect fit! 🙂