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This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations) and written observations, all designed to aid navigation.

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.

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.

A map of Java with mountains, jungles, animals and crops. Bathymetry (sea depth) is marked, including on an inset map of Batavia harbour. Illustrations include Batavia Castle, and a lion—representing Belgium—receiving tribute and enslaving locals.