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A late 18th century map of Asia published in London by John Bowles, with regions indicated by colour. Central Borneo is labelled ‘Part inhabited by the Biayos’, which is seen on many contemporary maps, often with the comment ‘a savage people’.

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.