One of the great sea charts in Dudley’s ‘Arcano del Mare’. It is the first printed English nautical atlas. It was superior to any previous work in that the charts illustrated the whole world, the first time any outside of Europe had been included. It was the first atlas to use Mercator’s projection throughout, and the earliest to show the prevailing winds, currents and magnetic deviation. Dudley improved upon the theory of navigating by the ‘Great Circle’, the shortest distance between two points on a globe. It would be the eighteenth century before cartographers used the projection consistently. During the great Dutch period not one atlas was produced using it. This chart of part of the Azores takes in the island of Corvo and a fictitious uninhabited island nearby. ‘Olhar o Mundo ler o Territorio’ Exhibition Catalogue p. 208; Shirley BL Atlases M.Dud-1a no. 47.