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A navigation map of a bay on the island of Weh, north of Sumatra. It features bathymetry (sea depth), reefs, shoals, and other obstructions (coral, mud, shells, stones, sand). Lighthouses are shown, with lines to indicate the limits of their range.

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.

Fifteen separate maps of bays and river mouths of Sumatra, including bathymetry (sea depth), anchor points, reefs and shoals, and tide data. There is a drawing of the mouth of the Pidada-rivier.

Eleven separate maps of bays and river mouths of Sumatra, including two bays on the island on Bras (Breueh Island), and the bay at Kota Radja (Banda Aceh). Bathymetry (sea depth), anchor points, reefs and shoals are marked, along with tide data.

Map of Banka (Bangka) Island, east of Sumatra, divided into administrative districts. Rocks, shoals, buoys and anchor points are marked around the coast, with mountains, wetlands, roads and settlements on land. Inset map of Pulau Liat (Liat Island).