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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.

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.

Navigation map of the Riau Strait between Batam, Bintan and Rempang (Riau Archipelago). Bathymetry (sea depth), lighthouses, bouys, currents and obstructions are marked. There are side views of islands and mountains (elevations) to use as landmarks.

Navigation map of the mouths of the Koealoe (Kualu) and Panei (Barumun and Bila) rivers on the east coast of Sumatra. Large sand and mud banks, bathymetry (sea depth), bouys and currents are marked. On land, tall trees are shown to use as landmarks.

Three maps of the Caroline Islands. One shows colonised areas in Southeast Asia: Dutch East Indies; British North Borneo, British New Guinea; German New Guinea; Philippines (Spain); Portuguese Timor. The route of the Challenger expedition is marked.

Designed to aid navigation around the western Java Sea, this map features bathymetry (sea depth), current and tide data, and is marked with shoals, reefs and other hazards. Written notes add details at specific locations (e.g. ‘heavy tide rips’).