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Navigation maps of two bays on the southeast coast of Borneo. Anchorages, bathymetry (sea depth), buoys, shoals and other obstructions are shown. There is an inset map of the roadstead—a body of water sheltered from tides/currents—at Balikpapan Bay.

Navigation map of the southern part of the Strait of Malacca. Bathymetry (sea depth), lighthouses (in red and yellow), shoals and other obstructions (clay, coral, mud, rocks, shells, stones, sand) are marked, with hills to use as landmarks.

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.

Map of Ara Bay (east coast of Sumatra). Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, stones, sand) are marked. Underwater trenches are shown, with light buoys, and there is an elevation view of the bay.

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.

Navigation map of the west coast of Celebes (Sulawesi), north of Makassar. Bathymetry (sea depth), shoals and other obstructions are marked, with hills and settlements as landmarks, and elevations (side views of hills) to aid navigation.

Navigation map of the west coast of Celebes (Sulawesi), north of Makassar. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with trees and hills as landmarks, and elevations (side views of hills) to aid navigation.

Navigation map of the west coast of Celebes (Sulawesi), north of Makassar. Bathymetry (sea depth), shoals and other obstructions are marked, with hills and settlements as landmarks, and elevations (side views of hills) to aid navigation.

Navigation map of the southern part of the Bangka Strait between Sumatra and Bangka Island. Bathymetry (sea depth), lighthouses, reefs, shoals and other obstructions (clay, coral, mud, stones, sand) are marked.

Five maps of bays of Java, including bathymetry (sea depth), anchor points, coastal hills, tide data, reefs and shoals. Obstructions in the water are marked ‘gr’ (rough), ‘h’ (hard), ‘k’ (clay), ‘kr’ (coral), ‘m’ (mud), ‘st’ (stones), and ‘z’ (sand).

Navigation map of the waters around the islands of Bengkalis, Pedang and Tebingtinggi, off the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, sand) are marked.

Map of the mouth of the Rokan River on the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, sand) are marked. Underlined numbers give the height of the ground above the water.