The project consist in among others, the flag registration of the vessel “Panther Primo” which is used to move technicians to the Gas platform “CASTOR” located off the coast of Vinaróz. With the available information of the vessel, the appropriate structural drawings were carried out, COTENAVAL also develope drawings in spanish (general arrangement, tank capacity, safety and fire-fighting, freeboard information, etc.) stability studies, and compliance reports accordance with the international regulations. Also as a complement of the flag registration, COTENAVAL has proceeded to assemble over the deck a crane for load and unload of containers and replaced one of the auxiliary engine.