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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.

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): 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.

A map to aid in the navigation of the rivers leading to Saigon (Ho Chi Minh City, Vietnam). Details include bathymetry (water depth), currents, and a side view (or ‘elevation’) of hills to use as a landmark. Tides are described in written remarks.

Map of the coastline of the bay of Batavia (Jakarta) showing the sand and mud bank and bathymetry (sea depth) in the bay. A plan of part of the city, including the fort, and the surrounding countryside are also included.

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.

A plan of Batavia in the early 19th century, with the castle, church, dock yard, timber yard and hospital highlighted on the map’s legend. Also shown is the canal flowing through the city to the port, where the sea depth (‘soundings’) is indicated.

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.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.