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Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

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.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

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.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

Map of the Batavia (Jakarta) Bay roadstead, a body of water sheltered from tides/currents, for ships to anchor. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there are written notes, all to aid navigation.

This map uses a variety of methods to aid navigation, including a rhumbline network (a web of lines to help plot routes). The numbers on the sea surface indicate depth (bathymetry), and the drawings of mountains (elevations) were used as landmarks.

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.

Unusually, north is located to the left of this map of East Asia, rather than the top. The text notes that shallows and reefs are marked, and that the map is based on the explorations of Portuguese ships. Illustrations include sea monsters and ships.