2. Off the West Coast of Africa, near Cape Verde Islands, Drake captured a Portuguese merchant ship, the Santa Maria, which he renamed Mary. Drake took from the ship a collection of maps, a ‘rutter’ (drawings of the coast lines), and an astrolabe (used for navigation). The ships captain, Nuno da Silva, who had significant knowledge of navigation was just as important as he knew about safe anchorages on the coats and where Drake could land to find water.