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A brightly-coloured hand-drawn map of the South China Sea. The compass is at the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, anchor points, 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.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, names of coastal settlements, and an elevation (side view) of a mountain at the north tip of Borneo.

This map of the Eastern Hemisphere (Asia, Europe, Africa) shows New Guinea (‘Nouvelle Guinee’) and Australia (‘Nouvelle Hollande’) as one landmass, demonstrating that there was some uncertainty about the area’s geography in the early 18th century.

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.

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’.

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.