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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.

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.

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’.

French text on the reverse of this map describes the religion, languages, crops, trade etc. of Aracam and Pegu (Myanmar), Siam (Thailand), Cambaja (Cambodia). The map is dedicated to the Dutch merchant Christophoro Thisio.