For vessels which are to undergo Part I Registration with the UK Shipping Register for merchant ships and pleasure vessels a tonnage measurement is required. Registration under Part 1 is generally required if the vessel is to be used as security for a marine mortgage. This boat survey does not relate to any aspect of the condition of the boat, but is a quite simply a measurement of the boat to a specific set of criteria combined with a verification of other aspects of the boat. Tonnage Surveys are carried out as an agent for the Yacht Designers and Surveyors Association.