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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.

A page from Abbé Prévost’s ‘Histoire Générale des Voyages’. The top map shows the Bay of Laphao on Timor, while the other drawings are side views (or ‘elevations’) of mountains on the region’s islands to use as landmarks when navigating.

Navigation map of the coast of the ancient kingdom of Pégou and near the town of Martaban (Mottama), Myanmar. Bathymetry (sea depth), anchor points, notes on currents and obstructions are marked, and there are drawings of side views of coastal hills.

Navigation map of the coast of the ancient kingdom of Pégou and near the town of Martaban (Mottama), Myanmar. Bathymetry (sea depth), anchor points, notes on currents and obstructions are marked, and there are drawings of side views of coastal hills.

Although mainly of India, this map of the Gulf of Bengal includes maritime routes near the west coast of Burma (Myanmar). The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Although mainly of India, this map of the Gulf of Bengal includes maritime routes near the west coast of Burma (Myanmar). The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

This 18th century maritime navigation map charts the waters between the islands of Java, Sumatra and Borneo. A route south towards the Sunda Strait, as taken by the French ship Mascarin in March and April 1772, is highlighted.

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 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 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.

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.