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Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

Navigation map of the southern part of the Strait of Malacca. Bathymetry (sea depth), lighthouses (in red and yellow), shoals and other obstructions (clay, coral, mud, rocks, shells, stones, sand) are marked, with hills to use as landmarks.

Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

A navigation map of the northern tip of Sumatra, featuring bathymetry (sea depth), reefs, shoals, and side views of landmark mountains (elevations). Lighthouses are highlighted in red and yellow, with lines to indicate the limits of their range.

This detailed map of the Dutch East Indies in the mid-19th century is spread over eight sheets, plus a cover sheet showing the whole area. There are numerous inset maps of islands, bays, cities etc.

This map of the Dutch East Indies is spread over eight sheets, with a hand-drawn cover sheet showing the whole area. There are numerous inset maps of islands, bays, cities etc. Two of the inset maps have a replacement map pasted over them.

Map of the Strait of Malacca, with inset maps of a central part of the strait and of the Singapore Strait. Bathymetry (sea depth), shoals and reefs are marked, and there are elevations (side views of hills and mountains to use as landmarks).

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. Pencil marks indicate the map was actually used.

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.

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.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the northern Malacca Strait—between Sumatra and Malaya—with shoals and reefs marked, some labelled as ‘dangerous’. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.