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Maritime routes had to be adjusted in response to the changing monsoon seasons, as is seen on this late 18th century map of the Indian Ocean. Drawings of the heads of children blowing—called ‘wind-heads’—are used to indicate wind direction.

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.

Two maps of the Indian Ocean showing currents (represented by arrows) and winds (represented by letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

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.

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.

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 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 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.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.