Indian Ocean trade Madagascar at this time leaving behind a lasting cultural and genetic legacy. Chinese fleets under Zheng He criscrossed the Indian Ocean during the early part of the 15th century. The missions were diplomatic rather than commercial, but many exchanges of gift and produces were made. The Portuguese under Vasco da Gama discovered a naval route to the Indian Ocean through the southern tip of Africa in 1497–98. Initially, the Portuguese were mainly active in Calicut, but the northern region of Gujarat was even more important for trade, and an essential intermediary in east-west trade. Venetian interests were directly threatened as
Winds in the Age of Sail with the summer monsoon and south with the winter monsoon. The Dutch republic began its remarkable rise about 1580 during its war of independence from Spain. With the union of the two crowns in 1580 it was also at war with Portugal. In 1595 Jan Huyghen van Linschoten published previously-secret Portuguese sailing directions for the Indian Ocean. The Dutch reached Java in 1596 and the Spice Islands in 1599. In 1611 Hendrik Brouwer found a better route to the East Indies. After reaching the roaring forties he continued east almost to Australia and then swung north. This avoided Portuguese warships