From surveys by the Chinese Maritime Customs between 1916 and 1930 ; published May, 1916, at the Hydrographic Office, under the authority of the Secretary of the Navy. Depths shown by soundings, tints, and isolines; relief by contours and spot heights. 1940 variation compasses. Tidal information and "average direction and rate of tidal streams" tables, buoy legend, navigational notes. Shows low water areas, islands, drainage, lights, vegetation/wetlands, roads, railroads, telegraph cables. Various points of interest, such as "chapel," "wreck," "submerged masonry." No. 3218.