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Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

The arrows on this map show the direction of the seasonal monsoons of Southeast Asia during the late 18th century. Each arrow has a label in French, indicating the month. The hatched sea areas are where the winds always blow in the same direction.

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.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.

Colourful hand-drawn portolan (nautical) navigation chart, featuring a rhumbline network (the web of interconnected lines), islands, shoals and reefs. With elaborately decorated scales and compass roses. Mounted on folding wood boards.