If you are looking for a vessel which are 33ft  and under in length - perhaps a small yacht, local boat or a dinghy - it will only be listed on the National Register of Historic Vessels if it is part of the National Historic Fleet.  However, the National Maritime Museum Cornwall maintains the National Small Boat Register.  This database already contains the details of nearly 700 small craft, but is continuing to develop and grow.  It actively seeks suggestions for new vessels to be added.