A Portuguese nau (carrack) as depicted in a map made in 1565.  Also available in the digital library of the University of Minnesoata (ID: 1043494).<a rel="nofollow" class="external autonumber" href="https://dcl.umn.edu/search/show_details?search_string=%20navigation%20charts&amp;per_page=60&amp;&amp;page=9">[1]</a>
Sebastião Lópes (15??–1596)<a rel="nofollow" class="external autonumber" href="http://www.aquimaria.com/html/forum-cartografia3.html">[2]</a>
Boxer, Charles R.. <i>O império marítimo português 1415–1825</i>. São Paulo: Companhia das Letras, 2002, <a href="//commons.wikimedia.org/wiki/Special:BookSources/8535902929" title="Special:BookSources/8535902929">ISBN 8535902929</a>