One long term goal of AtlantOS is to ensure that Atlantic data from different and diverse in-situ observing networks are readily accessible and useable to the wider community, international ocean science community and other stakeholders in this field. The AtlantOS Integrated Data Portal designed under WP7 “Data flow and integration” is not a new system. It is an integrated access to existing systems, these being enhanced to ingest more in-situ observation data on Atlantic and to better serve the users, in a harmonised way across the systems. The Networks involved in Data integration for AtlantOS were: (a) Ship-based observation Networks: GO-SHIP (Global Ocean Ship-based Hydrographic Investigations Program), VOS (Voluntary Observing Ship)/SOOP (Ship of Opportunity Program), CPR (Continuous Plankton Recorder), fish and plankton surveys (ICES), seafloor mapping; (b) Autonomous observing Networks: Argo, Gliders, Drifters, OceanSITES, EATN (European Animal Tracking Network); (c) Coastal observing systems: Ferrybox, FOS (Fishery Observing System), coastal profilers, fixed moorings.