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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.

Navigation chart of the Sunda Strait, showing bathymetry (sea depth), shoals and reefs, landmarks, and a rhumbline network. Notes record good anchorages, sources of water and supplies etc. Inset map of the Zutphen Islands off the coast of Sumatra.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with 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 the Indian Ocean showing the currents (represented by arrows) and winds (represented with 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 the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

Map of the Indian Ocean showing the currents (represented by arrows) and winds (represented with letters A to G) during the monsoon seasons. Three routes from the Isle de France (Mauritius) around the Indian Ocean are shown.

This mid-17th century Italian map is from Sir Robert Dudley's atlas ‘Dell'arcano del Mare’. It shows the Sunda Strait (‘Stretto di Sunda’) between the Southeast Asian islands of Sumatra and Java. Text on the map refers to currents (‘Corrente’).

Apart from some small islands, this mid-17th century Italian map of the Indian Ocean features no land other than the islands of Sumatra and Java in the top right corner. Text on the map refers to winds (‘Venti’) and currents (‘Corrente’).