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Map of the Gaspar Strait, off the east coast of Sumatra. The web of lines is a rhumbline network, numbers indicate sea depth (bathymetry), and there are side views of islands (elevations), all to aid navigation. Five 18th century routes are marked.

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.

There is a port at the south of this map of the Côn Đảo archipelago (Vietnam), and notes giving details such as a suitable location to careen ships (turning a ship on its side for cleaning or repair). A ruined English fort is also marked.

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 map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.

A map to aid navigation around the Bay of Turon (location of modern city of Da Nang, Vietnam). Bathymetry (sea depth) is marked, as is the route of the Dutch ship ‘Jackaij’ on her departure from the bay. An elevation view of the land is shown below.

A map to aid navigation around the Bay of Turon (location of modern city of Da Nang, Vietnam). Bathymetry (sea depth) is marked, as is the route of the Dutch ship ‘Jackaij’ on her departure from the bay. An elevation view of the land is shown below.

Two maps. One features most of the world, but with Borneo, Philippines and most of mainland Southeast Asia missing, though there is an inset map of Penang. The other is a navigation map of the strait at Penang, with bathymetry and elevations.

The many navigation aids marked on this map, including bathymetry (sea depth), anchor points, shoals, and elevations of hills, were designed to guide ships around this part of the west coast of Timor. The Dutch fort Concordia is also marked.

Hand-drawn map of islands in the Riau Archipelago, with bathymetry (sea depth) marked. It features side views of hills (‘elevations’) to use as landmarks, including ‘Jehore hill’, probably in Johor at the southern tip of the Malay Peninsula.

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.