Turn the sound off and fast forward 55 seconds on the video http://www.youtube.com/watch?v=eKxMEhI24FA&feature=c4-overview&list=UUEPmGUcgjoUWxyWdegxwRmQ
This vessel WIND was heading out of Harwich to Flushing, it is one of the wind turbine service platforms, a small one compared to some http://www.bbc.co.uk/news/science-environment-14412182