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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 Riau Strait between Batam, Bintan and Rempang (Riau Archipelago). Bathymetry (sea depth), current and tide data, reefs, shoals and other obstructions are marked. A second map features improvements to part of the original map.

Map of the east coast of the Aru Islands (Maluku Islands), with bathymetry (sea depth), tides and currents, shoals and other obstructions. An inset map shows the anchorage at islands off the coast, along with elevation views of the islands.