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Map of the Batavia (Jakarta) and Bantam (Bantem) roadsteads (a body of water sheltered from tides/currents, for ships to anchor). Shoals, reefs and bathymetry (sea depth) are marked, with explanatory notes and a rhumbline network to aid navigation.

Navigation chart of the Sunda Strait, showing bathymetry (sea depth), shoals and reefs, landmarks, and a rhumbline network. Notes record good anchorages, sources of water and supplies etc. Inset map of the Zutphen Islands off the coast of Sumatra.

A late 18th century navigation map of the waters between the islands of Java, Madura and Bali. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there is an inset map of the Bay of Ballambouang, Java.