Depths shown by isolines and soundings. "Universal transverse mercator (UTM) grid. Zone 31U, International spheroid for military grid references". "Soundings in meters." Map drawn in 2 segments. Map continued in inset. "Reproduction of Netherland chart 1541, New Edition, July 1970 with modifications according to agreement of 1967 between the Netherlands Hydrographic Department and the U.S. Naval Oceonagraphic Office (Chart production and distribution transferred to the Defense Mapping Agency Hydrograp[hic Center on July 1972,"
