POGO member institutions have been driving the establishment of OceanSITES, a network of deep-ocean, multi-disciplinary time-series reference sites, measuring many variables and monitoring the full depth of the ocean from the surface down to 5,000 metres. This network comprises about 30 surface and 30 sub-surface arrays. At its 2011 meeting in Seoul, POGO’s directors decided to give immediate priority to increasing support for OceanSITES. They also agreed to encourage all OceanSITES parties to maintain a minimum set of common measurements. OceanSITES moorings are integral to the Global Ocean Observing System, as they complement satellite imagery and Argo float data by adding time and depth, and by expanding what is observed.