The Piri Reis map is a pre-modern world map compiled in 1513 from military intelligence by the Ottomanadmiral and cartographer Piri Reis. The approximately one-third of the map that survives shows the western coasts of Europe and North Africa and the coast of Brazil with reasonable accuracy. Various Atlantic islands including the Azores and Canary Islands are depicted, as is the mythical island of Antillia and possibly Japan. The historical importance of the map lies in its demonstration of the extent of exploration of the New World by approximately 1510, perhaps before others. It used 10 Arabian sources, 4 Indian maps sourced from Portuguese and one map of Columbus.

http://en.wikipedia.org/wiki/Piri_Reis_Map