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Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

A hand-drawn map designed to aid navigation around the southern coast of Luzon and the islands of the central Philippines. It features side views of coastal hills and mountains (‘elevations’) to use as landmarks, as well as towns, shoals and reefs.