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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.

Nautical charts like this are detailed around the coasts and on the seas (e.g. river mouths, islands, shoals and reefs) while the interiors are blank. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry).

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.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

This map features eight expedition routes across the South China Sea from 1752 to 1763. The web of lines is a rhumbline network, and bathymetry (sea depth) is marked. The place names are in French, but with an English title and notes.

Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, names of coastal settlements, and an elevation (side view) of a mountain at the north tip of Borneo.

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.

Early navigation map of the South China Sea. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. A route around the Gulf of Thailand is marked with text and the dates 1643 and 1644.