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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.

Four navigation maps of the waterways and anchorages around the east coast of the Aru Islands (in the Maluku Islands, near New Guinea). Bathymetry (sea depth), shoals and other obstructions are shown, with trees and villages to use as landmarks.

Eight navigation maps from around the south coast of Celebes (Sulawesi). Anchorages, roadsteads (bodies of water sheltered from tides/currents), bathymetry (sea depth), shoals and other obstructions are shown, with hills and settlements as landmarks.

Navigation map of the Riau Roadstead (off west coast of Bintan, Riau Archipelago): a body of water sheltered from tides/currents, for ships to anchor. Bathymetry (sea depth) and various obstructions and landmarks (hills, buildings, trees) are shown.

Map of the Kai Islands, in the Banda Sea, designed for navigation: it features bathymetry (sea depth), tide data (arrows), reefs and shoals. Obstructions in the water are marked ‘kr’ (coral), ‘m’ (mud), ‘s’ (shells), ‘st’ (stones), and ‘z’ (sand).

A navigation map of the northern tip of Sumatra, featuring bathymetry (sea depth), reefs, shoals, and side views of landmark mountains (elevations). Lighthouses are highlighted in red and yellow, with lines to indicate the limits of their range.