Search

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.

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.