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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.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

This map of the Eastern Hemisphere was designed to show maritime routes from the Netherlands to Southeast Asia. It shows New Guinea (‘Nieuw Guinee’) and Australia (‘Nieuw Hollande’) as one landmass, connected via an area labelled ‘Karpentarie’.

Map of the Indian Ocean dominated by a rhumbline network—a web of interconnected lines used to help plot routes—with a compass rose at the centre. At the top there are (incomplete) drawings of people with text in Dutch, French, English and Spanish.

This map shows the route of the first Dutch expedition to Southeast Asia in 1595-7. Led by Cornelis de Houtman, it was an attempt to enter the spice trade. The route crosses east over the Indian Ocean, circles the island of Java, and returns west.

This map shows the route of the first Dutch expedition to Southeast Asia in 1595-7. Led by Cornelis de Houtman, it was an attempt to enter the spice trade. The route crosses east over the Indian Ocean, circles the island of Java, and returns west.