Before revision: European oceanic exploration started with the maritime expeditions of Portugal to the Canary Islands in 1336,and later with the exploration of the Atlantic archipelagos of Madeira and Azores, the coast of West Africa in 1434, and the establishment of the sea route to India in 1498 by Vasco da Gama, which initiated the Portuguese maritime and trade presence in Kerala and the Indian Ocean.
After revision: European oceanic Portuguese discoveries started with the maritime expeditions of Portugal to the Canary Islands in 1336,and later with the exploration of the Atlantic archipelagos of Madeira and Azores, the coast of West Africa in 1434, and the establishment of the sea route to India in 1498 by Vasco da Gama, which initiated the Portuguese maritime and trade presence in Kerala and the Indian Ocean.