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Chart of the north coast of Java, featuring a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals, reefs and side views of landmark mountains (elevations), all to aid navigation. With an inset map of nearby islands.

Chart of the north coast of Java, featuring a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals, reefs and side views of landmark mountains (elevations), all to aid navigation. With an inset map of nearby islands.

Navigation chart of the Sunda Strait, with sea depth, anchor points, shoals and other obstructions. Includes many bays, with four highlighted on inset maps. Partly based on writings of Captain Krusenstern whose 1806 route through the strait is shown.

Navigation chart of the Sunda Strait, with sea depth, anchor points, shoals and other obstructions. Includes many bays, with four highlighted on inset maps. Partly based on writings of Captain Krusenstern whose 1806 route through the strait is shown.

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.

Two maps of routes around the Flores and Banda seas—through the straits between the Lesser Sunda Islands and the Maluku Islands—towards China. Includes a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals and reefs.

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.

A late 18th century maritime navigation map of the straits east of Java, with drawings of the elevations of the straits. The map is also marked with routes of explorers, including the return of Captain Cook’s HMS Endeavour from Australia in 1770.

Map of the Batavia (Jakarta) and Bantam (Bantem) roadsteads (a body of water sheltered from tides/currents, for ships to anchor). Shoals, reefs and bathymetry (sea depth) are marked, with explanatory notes and a rhumbline network to aid navigation.

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.

A late 18th century navigation map of the waters between the islands of Java, Madura and Bali. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there is an inset map of the Bay of Ballambouang, Java.

A late 18th century maritime map of Southeast Asia, marked with expedition routes including the return of Captain Cook’s HMS Endeavour from Australia in 1770, and Captain Philip Carteret’s circumnavigation expedition in 1768.