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Map of the Gaspar Strait, off the east coast of Sumatra. The web of lines is a rhumbline network, numbers indicate sea depth (bathymetry), and there are side views of islands (elevations), all to aid navigation. Five 18th century routes are marked.

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.

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.

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.

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.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, and names of coastal settlements, all to aid navigation. With a colourful compass rose.