A fine sea chart of the coast of Portugal from Syntra to Figemonte in the Algarve. The harbour of Lisbon is featured in some detail with extensive notations of depths. The whole is decorated with an ornate title cartouche, a compass rose and a ship. The map was published in Sir Robert Dudley’s magnificent ‘Arcano del Mare’. Lord Wardington wrote that it is “ONE OF THE GREATEST ATLASES OF THE WORLD and one of the most complex ever produced: it is the first sea-atlas of the whole world; the first with all the charts constructed using Mercator’s new projection, as corrected by Edward Wright; the first to give magnetic declination; the first to give prevailing winds and currents; later to be further expanded by Maury and J.T. Towson in the nineteenth century; the first to expound the advantages of ‘Great Circle Sailing’; and the first sea-atlas to be compiled by an Englishman, albeit abroad in Italy” (Lord Wardington, ‘Sir Robert Dudley’, in ‘The Book Collector’, I 52 (2003). Not in ‘Cartografia Impressa dos Seculos XVI e XVII Imagens de Portugal …’ Exhibition Catalogue; Conde (2003) p. 189; Shirley (2004) M.Dud-1a 36.