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Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

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.

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations), all designed to aid navigation. The various straits used around Singapore 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.

Hand-drawn map of the Singapore Strait, with Singapore above (green coastline) and the Riau Archipelago below. Bathymetry (sea depth), shoals and reefs are marked. Two mountains at the eastern end of the strait are shown in profile as landmarks.