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Map focusing on the passage between Penang Island and the mainland, with shoals and reefs marked and described, and bathymetry (sea depth) shown. There are anchor points at George Town harbour, and landmarks—hills, trees, a fort—to aid navigation.

Map focusing on the passage between Penang Island and the mainland, with shoals and reefs marked and described, and bathymetry (sea depth) shown. There are anchor points at George Town harbour, and landmarks—hills, trees, a fort—to aid navigation.

Plan of the canals and rivers flowing through the city of Batavia (Jakarta), passing through the port before reaching the pier and the bay. The bay has a sand bank and figures for water depth. There are profile drawings of two of the city’s rivers.

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.

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.

Plan of improvements made to the pier at the port in Batavia (Jakarta): red lines show new parts added in 1822; numbers record the change in water depth (red is 1818; black is 1822). Planned future works and the ‘Waterkasteel’ fort are also shown.

Plan of improvements made to the pier at the port in Batavia (Jakarta): red lines show new parts added in 1822; numbers record the change in water depth (red is 1818; black is 1823). Planned future works and the ‘Waterkasteel’ fort 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.

Map of the Dutch town and naval base on the island of Onrust in Batavia (Jakarta) Bay, and adjacent islands, featuring the dock, boat and work sheds, ammunition stores, forge, hospital and housing. Shoals, reefs and bathymetry (sea depth) are marked.

A hand-drawn plan for improvements to the pier at the port in Batavia (Jakarta), showing profiles of stone and concrete walls/buttresses to be built along the sides of the ‘Haven Kanaal [Harbour Canal]’. Blue lines on the profiles mark water level.

Plan of the pier at the port of Batavia (Jakarta). Lines indicate the changing position of the beach and the sandbank over the years, and numbers show the water depth (red numbers=measured in the year 1823, blue=1831 and black=1864).

Plan of the pier at the port of Batavia (Jakarta). Lines indicate the changing position of the beach and the sandbank over the years, and numbers show the water depth (red numbers=measured in the year 1823, blue=1831 and black=1864).