 The caravel was developed in about 1451, based on existing fishing boats under the sponsorship of Henry the Navigator of Portugal, and soon became the preferred vessel for Portuguese explorers like Diogo Cão, Bartolomeu Dias or Gaspar and Miguel Corte-Real, and by Christopher Columbus.They were agile and easier to navigate than the barca and barinel, with a tonnage of 50 to 160 tons and 1 to 3 masts, with lateen triangular sails allowing beating.Being smaller and having a shallow keel, the caravel could sail upriver in shallow coastal waters.