The naus of Gonçalo Roiz (c. 1600)
and Sebastião Themudo (1598) are two manuscripts copied by Lavanha and transcribed and published by João
da Gama Pimentel Barata in his comments to Lavanha's Livro Primeiro. These two short descriptions of India naus contain
only the measures and features considered by their authors fundamental in the definition of these ships and present
precious information on the length of keel and posts, number of pre-designed frames, and other basic characteristics,
such as the shape of the transom.