Henry the Navigator was influential primarily because he was a patron of explorers and paid for many expeditions. While he did not sail himself, he significantly advanced the Age of Exploration by supporting various maritime expeditions along the African coast and to the Atlantic Islands. His financial backing and encouragement of exploratory voyages laid the groundwork for future discoveries and the expansion of European influence across the globe.
Additionally, Henry is often credited with promoting advancements in navigation and cartography, and his efforts contributed to the development of new maritime technologies and techniques, including the establishment of a navigational school in Sagres, Portugal. However, the key aspect of his influence was his role as a patron and supporter of exploration initiatives.