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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.

Map of the coast of Selangor on the west of the Malay Peninsula. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are drawings of the side views of mountains (elevations), all to aid navigation.

Map of the coast of Selangor on the west of the Malay Peninsula. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are drawings of the side views of mountains (elevations), all to aid navigation.

A map of the bay of the port city of Batavia (Jakarta). To aid navigation, a rhumbline network (the web of interconnected lines), bathymetry (sea depth), and small islands, shoals and reefs are marked. An inset map shows the city in more detail.