MAREL SMILE is a component of the coastal observing network COAST-HF. The MAREL (Mesures Automatisées en Réseau pour l’Environnement Littoral) SMILE system developed and implemented by Ifremer (French Research Institute for Exploitation of the sea) & the University of Caen Normandy in 2015 is a moored buoy equipped with physico-chemical and biological measuring devices working in continuous and autonomous conditions. The system is located 2 nautical miles north of Luc-sur-mer (Basse normandie, Central English Channel) influenced both by marine coastal and fresh waters. The measuring station is equipped with high performance systems for seawater analysis and near real time data transmission. This system records with a high frequency resolution (20 minutes), the following parameters, gust wind speed, wind from direction relative true north, horizontal wind speed, relative humidity, atmospheric pressure at sea level, air temperature in dry bulb, light irradiance surface PAR, sea temperature, practical salinity, dissolved oxygen, fluorescence, turbidity.