Perhaps it might be better to describe this image as a photograph of a dredging operation rather than an image of a specific dredging vessel. The image was captured in May 2014 off the mouth of the River Medina at Cowes Isle of Wight and shows the dredging platform D2 being assisted by the Williams Shipping Port Tender Wiljive. I do not know how you might describe the activity in technical terms. The image was captured from the deck of a Red Funnel car and passenger ferry.