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Navigation map of the waters and straits around some of the islands of the Riau Archipelago, between Sumatra and Batam. Bathymetry (sea depth), current and tide data, reefs, shoals and other obstructions (clay, mud, shells, stones, sand) are marked.

Navigation map of the waters and straits around some of the islands of the Riau Archipelago, between Sumatra and Batam. Bathymetry (sea depth), current and tide data, reefs, shoals and other obstructions (clay, mud, shells, stones, sand) are marked.

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.

Although mainly a navigation map—with a rhumbline network and elevations of mountains—there are also many terrestrial details shown, such as settlements and mountains. The inset map of Hoeamohel details plantations and the cultivation of nut crops.

This colourful hand-drawn portolan (nautical) chart was designed to aid navigation. It features a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, anchor points and written notes.