Tonnage surveys are required to register a vessel under Part I of the British Registry and when taking out specific marine finance. Please note that a tonnage survey is not a check of the condition of the vessel. We provide tonnage surveys through the YDSA and fees are charged against a set scale. See http://www.ydsa.co.uk/registration.html for details. The measurements for a tonnage survey can be incorporated in a pre-purchase survey if required.