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Nautical charts like this are detailed around the coasts and on the seas (e.g. river mouths, islands, shoals and reefs) while the interiors are blank. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry).

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.

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.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

The cartouche on this early 18th century navigation map features the title in Latin and Dutch, as well as a wealth of detailed drawings illustrating the region’s trade: Asian merchants, their goods and animals, and two female European customers.

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.

The outline of the island of New Guinea is very vague on this early 17th century map of Southeast Asia. The cartouche is decorated with two figures of Asian warriors: one holds a spear, the other a sword. There are also drawings of mermaids.

The outline of the island of New Guinea is very vague on this early 17th century map of Southeast Asia. The cartouche is decorated with two figures of Asian warriors: one holds a spear, the other a sword. There are also drawings of mermaids.

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.

Colourful hand-drawn portolan (nautical) navigation chart, featuring a rhumbline network (the web of interconnected lines), islands, shoals and reefs. With an elaborately decorated cartouche, scale and compass roses. Vellum on folding wood boards.