His surviving cartographic work includes manuscripts of Ptolemy's Geographia, manuscripts of Insularium illustratum (a descriptive atlas of island maps), and two world maps which were the first to show a passage around the southern tip of Africa into the Indian Ocean. His world maps summarize geographical knowledge at the outset of the Age of Discovery and "epitomize the best of European cartography at the end of the fifteenth century."
His surviving cartographic works include manuscripts of Ptolemy's Geographia, a descriptive atlas of island maps called Insularium illustratum, and two world maps that were the first to show a route around the southern tip of Africa into the Indian Ocean. These maps represent the pinnacle of European cartography at the end of the 15th century.