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To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), tide information, shipwrecks, compass roses and landmark mountains at the coasts.

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.

The arrows on this map mark the direction of the seasonal monsoons experienced in the South China Sea and Philippine Sea during the late 18th century. Each arrow has a label indicating the month.

Coloured borders on this map show the kingdoms of mainland Southeast Asia and the Philippines. Arrows marked on the sea to the west of the Philippines indicate wind direction during the monsoon seasons (with the months marked in French).

The arrows on this map mark the direction of the seasonal monsoons experienced around the Sunda and Maluku Islands (mainly modern Indonesia) during the late 18th century. Each arrow has a label in French, indicating the month.

The arrows on this map mark the direction of the seasonal monsoons experienced around the Sunda and Maluku Islands (mainly modern Indonesia) during the late 18th century. Each arrow has a label in French, indicating the month.

Map dedicated to William Cowper, whose coat of arms sits atop the cartouche. It features two horses holding a crest with three martlets (mythical birds used in heraldry). The cartouche also features Asian traders. Monsoons are marked on the map.

This map showcases the colonial territories of Southeast Asia in the 18th century, with text detailing trading information and the products of each region. There are five inset maps featuring plans of specific trading ports.

This map showcases the colonial territories of Southeast Asia in the 18th century, with text detailing trading information and the products of each region. There are five inset maps featuring plans of specific trading ports.

This map showcases the colonial territories of Southeast Asia in the 18th century, with text detailing trading information and the products of each region. There are five inset maps featuring plans of specific trading ports.

The arrows on this map show the direction of the seasonal monsoons: each arrow has a label, indicating the month. The northeast coast of Borneo is labelled ‘A Desart [desert/deserted?] Coast’, while the south is labelled ‘Pepper Country’.