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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).

Maritime routes had to be adjusted in response to the changing monsoon seasons, as is seen on this late 18th century map of the Indian Ocean. Drawings of the heads of children blowing—called ‘wind-heads’—are used to indicate wind direction.

Two maps of the Indian Ocean showing currents (represented by arrows) and winds (represented by letters A to F) during the monsoon seasons. Three routes—one old and two new—from the Isle de France (Mauritius) east to the Strait of Malacca are shown.

Map of Asia, with mainland Southeast Asia in red and divided into ancient kingdoms, Sunda Islands in yellow, and the Philippines in grey. Twelve different scales are shown, as different countries used different measurement systems.

Map of Asia, with mainland Southeast Asia in red and divided into ancient kingdoms, Sunda Islands in yellow, and the Philippines in grey. Twelve different scales are shown, as different countries used different measurement systems.

A late 18th century map of maritime Southeast Asia by the French geographer Jacques Nicolas Bellin (1703–1772). The title refers to the ‘Stretto della Sonda’ (Sunda Strait), the strait between the islands of Sumatra and Java.

This map uses colour to identify regions in late 18th century Southeast Asia, many of which roughly correspond to modern countries: Pegu=Myanmar, Tonkin/Cochin China=Vietnam, Lao =Laos, Siam=Thailand, Malaya=Malaysia, Philippin Islands=Philippines.

This late 18th century map of Asia by the British mathematician and cartographer Samuel Dunn uses an azimuthal projection to aid navigation.

Spread over two sheets, this map of India also features the west coast of mainland Southeast Asia. There is also an inset map of the bay of Ashem (Banda Aceh, Sumatra), featuring bathymetry (sea depth), islands, shoals and reefs, and anchor points.

Spread over two sheets, this map of India also features the west coast of mainland Southeast Asia. There is also an inset map of the bay of Ashem (Banda Aceh, Sumatra), featuring bathymetry (sea depth), islands, shoals and reefs, and anchor points.

This map was intended for navigation purposes, with bathymetry (sea depth), reefs, shoals and anchor points marked. One island is labelled ‘like a sugar loaf’, another ‘like a turtel [turtle]’. Oedong Sallang is the island of Phuket, Thailand.

Map of Asia showing New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Holland’) as one landmass, demonstrating that there was some uncertainty about the area’s geography in the early 18th century. However, it does include New Britain (‘N. Bretanje’).