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Updated: May 23, 2025
Just at the beginning of the fourteenth century, however, a new line was struck out in map-making by the construction and steady development of sailing charts, or "portolani." These humble attempts at geographical representation were intended as practical aids to navigation for Mediterranean mariners, and were based on practical observation.
Thus, at the very beginning of the fifteenth century European explorers had the benefit of the traditional ancient geography, of the new exactness of knowledge drawn from the observations of recent travellers, of the accurate but limited portolani of the Italian navigators, and finally of the more pretentious, if vague and often misleading, world maps of learned geographers.
Columbus had seen maps and charts among them the famous 'portolani' of Benincasa at Genoa; but I think it unlikely that he was so familiar with them as to have adopted their terms in his thoughts about the earth. He had seen the Mediterranean and sailed upon it before he had seen a chart of it; he knew a good deal of the world itself before he had seen a map of it.
Columbus had seen maps and charts among them the famous 'portolani' of Benincasa at Genoa; but I think it unlikely that he was so familiar with them as to have adopted their terms in his thoughts about the earth. He had seen the Mediterranean and sailed upon it before he had seen a chart of it; he knew a good deal of the world itself before he had seen a map of it.
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