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Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map features eight expedition routes across the South China Sea from 1752 to 1763. The web of lines is a rhumbline network, and bathymetry (sea depth) is marked. The place names are in French, but with an English title and notes.

This map features maritime routes: between Siam and Batavia; and five routes of the explorers Juan Gaetan and Olivier du Nord (dated 1542) east of the Philippines. The cartouche has a colourful illustration of Asian people in traditional costume.

Map of the Indian Ocean dominated by a rhumbline network—a web of interconnected lines used to help plot routes—with a compass rose at the centre. At the top there are (incomplete) drawings of people with text in Dutch, French, English and Spanish.

A brightly-coloured hand-drawn map of the Gulf of Siam, made for a ship’s captain. The elaborate compass roses are the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, shoals and reefs are also marked.

Early navigation map of the South China Sea. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. A route around the Gulf of Thailand is marked with text and the dates 1643 and 1644.