What is the greatest contribution of Sebastian vizcaino?

Sebastián Vizcaíno was a notable Spanish explorer and navigator in the early 17th century, best known for his exploration of the California coast. His greatest contribution lies in his detailed mapping and descriptions of the region, particularly the San Diego Bay and Monterey Bay, which provided valuable geographic information for future explorers and settlers. Vizcaíno's expeditions helped establish Spanish claims to California and laid the groundwork for subsequent missions and settlements in the area. His work significantly influenced the European understanding of the California coastline.