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Maps like this aided navigation through the islands, shoals and reefs of Singapore and the Malacca Strait. Three routes around Singapore are shown, numbers on the sea indicate water depth, and the profile views of mountains were used as landmarks.

This map shows the route of the first Dutch expedition to Southeast Asia in 1595-7. Led by Cornelis de Houtman, it was an attempt to enter the spice trade. The route crosses east over the Indian Ocean, circles the island of Java, and returns west.