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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.

On this map of Asia, Borneo is labelled ‘The Inland Part of this Island is inhabited by the Biayos a savage People’, a description seen on many contemporary maps. The ancient kingdoms of mainland Southeast Asia are also shown.

On this map of Asia, Borneo is labelled ‘The Inland Part of this Island is inhabited by the Biayos a savage People’, a description seen on many contemporary maps. The ancient kingdoms of mainland Southeast Asia are also shown.

Longitude is indicated in two different ways on this mid-18th century map: along the top border, it is shown in degrees (number of degrees east of London); more unusually, along the bottom border, it is shown in time (number of hours east of London).

An early 18th century navigation map, with a rhumbline network and a scale in English, French, Spanish and Dutch measurements. The cartouche includes a drawing of Asian people as primitive natives, as they were often seen in the West at the time.