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This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

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.

This map of Asia features four different scales: French, Russian, Turkish and Chinese. Each country had their own measuring system, so this was not uncommon at the time.

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.