Recent CTD data from the upper 2000 meters of all ice-free areas of the World Ocean provide the most reliable salinity correction data for the vast number of temperature and salinity profiles generated by the ca. 3000 free-drifting profiling floats of the international Argo program http://www.argo.ucsd.edu/. Float salinity corrections are periodically updated. Hence rapid receipt of new CTD data is extraordinarily valuable to the Argo community. The CCHDO has teamed with Argo to provide a single site for data providers to submit proprietary CTD data which are not public, and which are to be used only for Argo data correction. The CCHDO does not post such data on its public web site, but instead sees that only the appropriate Argo data center receives them. The CCHDO will not make "for Argo only" data public without the consent of the data provider.