Ruscelli's mariner's map is based on Gastaldi's map of 1548. The landmasses are shown with little interior detail but with a fair number of coastal place names. The North American continent is most interesting with the western coastline extending to join Asia. The continent is nearly divided by a large inland sea. In the Northeast the Montagna Verde appears just below an isthmus that connects to Greenland and then onto the Scandinavia. Below South America is a huge island of Tierra del Fuego. Loxodromic lines crisscross the map radiating from sixteen focal points and the sea is stipple engraved. Italian text on verso.