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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.

Navigation chart of the east coast of mainland Southeast Asia, from Cambodia to China. Islands, shoals and reefs are marked, along with bathymetry (sea depth). There are seven side views of islands (elevations) to use as landmarks.

A map to aid navigation around the Touranne Bay (Bay of Turon, location of modern city of Da Nang, Vietnam). The web of lines is a rhumbline network, and bathymetry (sea depth), anchor points and two elevation views of the coasts are shown.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

A map to aid navigation around the Bay of Touranne (Bay of Turon, location of modern city of Da Nang, Vietnam). The web of lines is a rhumbline network, and bathymetry (sea depth), anchor points and two elevation views of the coasts are shown.

Map of the Gulf of Siam (Gulf of Thailand) with shoals and small islands marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. There is an inset map of the Redang Archipelago.

Map of the coast of Selangor on the west of the Malay Peninsula. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are drawings of the side views of mountains (elevations), all to aid navigation.

Map of the northern Malacca Strait—between Sumatra and Malaya—with shoals and reefs marked, some labelled as ‘dangerous’. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the Gulf of Siam (Gulf of Thailand) with shoals and small islands marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. There is an inset map of the Redang Archipelago.