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Produced by the British Admiralty’s Hydrographic Office, this map includes various navigational aids, such as maritime routes, bathymetry (sea depth), tide and current data, and elevations (side views of hills and mountains to use as landmarks).

Southeast Asia is shown on sheets two and three of this 12-sheet map of the Indian and Pacific oceans, including detailed inset maps of the straits of Singapore, Bangka, Gaspar and Sunda, with bathymetry (sea depth), shoals, reefs, anchorages etc.

Navigation chart of the Sunda Strait, showing bathymetry (sea depth), shoals and reefs, landmarks, and a rhumbline network. Notes record good anchorages, sources of water and supplies etc. Inset map of the Zutphen Islands off the coast of Sumatra.