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A series of four maps of the Indian Ocean—one for each quarter of the calendar year—showing the direction and intensity of the winds, including around the seas of Southeast Asia. There are extensive explanatory notes.

Map of the Indian Ocean showing the currents (represented by arrows), including during the North East and North West monsoons. Numbers on the arrows indicate the current’s speed.

Chart of the Indian Ocean, showing climate and weather-related data, including around the seas and straits of Southeast Asia where trade routes are marked, along with monsoon and typhoon regions, and currents during the different monsoon seasons.

This map of Java uses hachures: short lines/dashes that give a sense of the shape and steepness of terrain. The coast is marked with shoals and reefs (dotted lines and crosses), bathymetry (sea depth, in figures) and anchor points (anchor symbols).