Windfarm Vessel

I've seen this vessel before and wondered what it is. Today it appeared on the horizon in the shadow of North Barrule & Snaefell on the Isle of Man.
It is a rare day when the Isle of Man is clearly visible across the Irish Sea.
The combination of subject, shades and textures had me running for my camera. These hills are 40miles from Whitehaven and so I needed maximum telephoto 350mm (525 full frame).
I looked the vessel up on Marine Radar and it is a Dutch Vessel, TIV MPI Adventure engaged here in Wind Turbine maintenance and installation.