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The many navigation aids marked on this map, including bathymetry (sea depth), anchor points, shoals, and elevations of hills, were designed to guide ships around this part of the west coast of Timor. The Dutch fort Concordia is also marked.

Map of Timor with Dutch and Portuguese flags marking military forts. Details are represented pictorially e.g. villages by small houses, forests by trees. There are extensive handwritten annotations, with some text translated from Dutch to French.

Hand-drawn portolan (nautical) chart of the Lesser Sunda Islands, featuring a rhumbline network (the web of interconnected lines), shoals, reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.