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Navigation map of the northwest coast of Sumatra. Bathymetry (sea depth), anchor points, shoals and other obstructions (clay, coral, mud, stones, sand) are marked, with hills and settlements to use as landmarks.

Navigation map of the Riau Strait between Batam, Bintan and Rempang (Riau Archipelago). Bathymetry (sea depth), lighthouses, bouys, currents and obstructions are marked. There are side views of islands and mountains (elevations) to use as landmarks.

The colonial territories of British North Borneo are shown in pink on this late 19th century map, with Brunei and Sarawak in green, and Dutch colonial territory in yellow. Sea routes around the British Empire are depicted on an inset map.