The marine network consist of a variety of ships and fixed station installations covering the open ocean and coastal areas, and for this purpose the network is divided into 3 categories; Voluntary Observing Ships (VOS), Fixed Ocean Stations (FOS), and Marine Flux Towers (MFT). We are also working towards getting Repeat Ocean Stations (ROS) accepted as a station type. For each category the required parameters (called core parameters) and the frequency of measurements are defined the tables in the ICOS Marine Labeling Stage 2 document (Version 3) . The tables also defines the criteria to become a Class 1 and Class 2 station. This classification is a part of the ICOS station labelling process.