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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).

On this map of Sumatra, the west coast mountain ranges contrast with the rivers to the east. An inset map of Singapore focuses on jungles along the coasts, and features bathymetry (sea depth) around the south coast and along the Singapore Strait.

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.

The ports of Batavia (Jakarta) and Bantem (Banten) feature on this navigation map of the north coast of Java. Shoals, reefs, bathymetry (sea depth, in figures) and anchor points are marked, with explanatory notes written next to some islands/reefs.

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.

To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), past explorers’ routes, shipwrecks and text about monsoons, typhoons and currents.

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.

Plan of improvements to the pier at the port in Batavia (Jakarta): new parts added in 1822 are labelled AB; numbers record the change in water depth (red is before the improvements; black is after). Planned future works (labelled BC) are also shown.

Plan of improvements made to the pier at the port in Batavia (Jakarta), including profile drawings of the construction parts. Lines indicate the changing position of the beach and the sandbank over the years, and numbers show the water depth.