src: www.commercialribcharter.co.uk
The Royal Charter Survey Boat is a 40 ft survey catamaran owned and operated by Peel Ports Liverpool. The vessel, constructed by Crosshaven Marine (Cork, Ireland) in 2007 and has operated on the Mersey, Manchester Ship Canal, Heysham and Clydeport on the River Clyde. The vessels main role is using sonar hydrographic surveying equipment to gather topographic data of the seabed which is then used for Admiralty chart info, dredging plans and searching for anomalies. The vessel is based in Brocklebank dock, Liverpool and sails daily with of a crew of 2-3.
Source of article : Wikipedia