Documented vessels must be at least 5 net tons. If over that weight, and used exclusively for pleasure, it may be documented by the Coast Guard, or registered in the state in shich it resides, at the owners option.
The document identifies the vessel by it's home port, port of documentation, official number, net & gross tonnage, and owner's name and address. The original Certificate of Documentation must be carried on board at all times. The vessel must have the official number marked by any permanent method on some clearly visible interior structural part of the vessel.
They must display the name and hailing port, including city & state in letters at least 4 inhes high on some clearly visible, exterior part of the vessel.