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A map of the northern coast of Java and the important port cities of Batavia (Jakarta) and Bantem (Banten). The web of lines is a rhumbline network, and shoals, reefs and bathymetry (sea depth) are marked, all to aid navigation.

This map uses a variety of methods to aid navigation, including a rhumbline network (a web of lines to help plot routes). The numbers on the sea surface indicate depth (bathymetry), and the drawings of mountains (elevations) were used as landmarks.