The European FerryBox Network is a collaborative follow-up initiative of the European FerryBox Project to encourage and support underway measurements from ferries and other suitable ships of opportunity (SOO) to better monitor the environmental conditions of the oceans. This network is jointly maintained by the FerryBox project partners. The European FerryBox Project was a multi-disciplinary research and development project to qualify and foster routine underway measurements from ferry boats to demonstrate usefulness and application possibilities in European Seas.