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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.

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 of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes 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.

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.

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.

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.

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.

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.

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.

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.