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Nautical chart of Portuguese cartographer Fernão Vaz Dourado (c. 1520 - c. 1580), part of a nautical atlas drawn in 1571 and now kept in the Portuguese National Archives of Torre do Tombo, Lisbon.
Photo credit: Portuguse National Archives of Torre do Tombo, Lisbon

A pre-Mercator nautical chart of 1571, from Portuguese cartographer Fernão Vaz Dourado (c. 1520 – c.1580). It belongs to the so-called plane chart model, where observed latitudes and magnetic directions are plotted directly into the plane, with a constant scale, as if the Earth were plane.