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Two maps of routes around the Flores and Banda seas—through the straits between the Lesser Sunda Islands and the Maluku Islands—towards China. Includes a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals and reefs.

Navigation chart of the east coast of mainland Southeast Asia, from Cambodia to China. Islands, shoals and reefs are marked, along with bathymetry (sea depth). There are seven side views of islands (elevations) to use as landmarks.

A map to aid navigation around the Touranne Bay (Bay of Turon, location of modern city of Da Nang, Vietnam). The web of lines is a rhumbline network, and bathymetry (sea depth), anchor points and two elevation views of the coasts are shown.

A map of the bay of the port city of Batavia (Jakarta). To aid navigation, a rhumbline network (the web of interconnected lines), bathymetry (sea depth), and small islands, shoals and reefs are marked. An inset map shows the city in more detail.

A brightly-coloured hand-drawn map of the Gulf of Siam, made for a ship’s captain. The elaborate compass roses are the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, shoals and reefs are also marked.

A brightly-coloured hand-drawn map of the South China Sea. The compass is at the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, anchor points, shoals and reefs are also marked.