China Delayed Mode Database for NEAR-GOOS (CDMDB) is operated by the National Marine Data and Information Service of China (NMDIS). CDMDB service provides oceanographic data and information products (Buoy data, Ship reports, GTS data, Meteorological data, SST and salinity data, wind and wave data, and so on), free of charge, to all the NEAR-GOOS users through the Internet.