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Two maps of routes around the Flores and Banda seas—through the straits between the Lesser Sunda Islands and the Maluku Islands—towards China. Includes a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals and reefs.

This early 18th century maritime map charts the waters between the islands of Java, Madura and Bally (Bali). The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.