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This colourful hand-drawn portolan (nautical) chart was designed to aid navigation. It features a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, anchor points and written notes.

Hand-drawn portolan (nautical) chart of the Lesser Sunda Islands, featuring a rhumbline network (the web of interconnected lines), shoals, reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.

A richly illustrated circular map of the world, surrounded by a ring of stars and sky, and spread over four sheets. The corners contain drawings of Atlas and Hercules holding the Earth on their shoulders, and of various philosophers and astronomers.

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.

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.

This map focuses on maritime trade, with detailed coastal areas (and blank interiors), illustrations of sailing ships, a rhumbline network—a web of lines used to aid navigation—and an elaborate cartouche illustrated with traders and their wares.

Map of Asia illustrated with four large allegorical drawings representing the Dutch East India Company, by the Dutch Baroque artist Romeyn de Hooghe. Includes scenes of Asian merchants, the capturing of crocodiles and elephants, and mythology.

This map of Southeast Asia features a rhumbline network, a web of lines used to aid navigation. Coastal areas are detailed while interiors are mainly blank, and there are illustrations of sailing ships, reinforcing the maritime focus of this map.

This map of Southeast Asia features a rhumbline network, a web of lines used to aid navigation. Coastal areas are detailed while interiors are mainly blank, and there are illustrations of sailing ships, reinforcing the maritime focus of this map.

A map of the northern Philippine islands with a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), shoals and reefs are marked, reinforcing the maritime theme. The compass rose points left, indicating north’s direction.

This seventeenth century map focuses on the Sunda Islands of maritime Southeast Asia, and features a rhumbline network, a web of lines to help plot routes and aid navigation.