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A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

A navigation map of the Java Sea and Sunda Islands, with bathymetry (sea depth), maritime routes, shoals and reefs, and elevations (side views of terrestrial landmarks). Inset maps feature the bay at Batavia and the straits between the Sunda Islands.

Maritime map of the Philippines, with inset maps of bays showing bathymetry (sea depth), shoals, reefs and anchor points. There is also an inset map of Taal Volcano, and elevations (side views of terrestrial landmarks like mountains and islands).

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).

Hand-drawn map of routes through the Iris-straat (Iris Strait) and Triton’s-baai (Triton Bay) in New Guinea. Bathymetry (sea depth) and reefs are shown, and there is an elevation (side view) of the islands and hills seen at the bay’s entrance.

Chart of the Singapore Strait, Riau Archipelago and Lingga Islands, marked with bathymetry (sea depth), side views of landmark mountains (elevations), written notes, and islands, shoals and reefs, all to aid navigation.

Chart of the Singapore Strait, Riau Archipelago and Lingga Islands, marked with bathymetry (sea depth), side views of landmark mountains (elevations), written notes, and islands, shoals and reefs, all 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. 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.

Navigation chart of part of the South China Sea leading to the eastern entrance of the Singapore Strait. Features bathymetry (sea depth), anchor points, shoals and other obstructions, landmark hills, and detailed explanatory notes.