A Navigator of Unknown Waters Born around 1450 in Santoña, Spain, Juan de la Cosa was a man shaped by the salt and timber of the Cantabrian coast. He was not a painter of canvases, but a master of the sea and the parchment that mapped it. His father, a shipwright, provided the foundation for a life spent amidst the creak of hulls and the scent of fresh sawdust. This early immersion in the mechanics of seafaring allowed him to understa…