Henry the Navigator never sailed the seas or traveled from from his home. Yet, this Portuguese Duke had a great impact on exploration during the 15th through 17th centuries. In what way was the Duke influential?

Henry built new kinds of ships for the explorers to use.
Henry ran a school of navigation where maps were created.
Henry discovered how to avoid diseases common in sailing ships.
Henry was a patron of explorers and paid for many expeditions.

Question

Henry the Navigator never sailed the seas or traveled from from his home. Yet, this Portuguese Duke had a great impact on exploration during the 15th through 17th centuries. In what way was the Duke influential?
 	
	Henry built new kinds of ships for the explorers to use.
	Henry ran a school of navigation where maps were created.
	Henry discovered how to avoid diseases common in sailing ships.
	Henry was a patron of explorers and paid for many expeditions.