Portuguese sea power becomes more pronounced with the nau, a prototype version of the carrack. Borrowing the sturdy hull of the cog and the lateen sail used by the Saracens, the Nau is a hybrid of sailing traditions from the Atlantic and the Mediterranean, all meant to come togethet to form a new type of vessel capable of long-distance voyages and some greater mobility. Thus, the Nau, although smaller than a normal carrack, combines the rate of fire and the armour of a carrack with the hull of a lantern galley, lending it the same manoeuvreability.