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Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

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.