Continuous, flow-through measurements of temperature and salinity have been collected with thermo-salinographs for decades (e.g. Henin and Grelet, 1996), which has led to well-established protocols for quality control, archiving and distribution of such underway data (e.g. Gosud, Surface (Underway) Temperature/Salinity Data). Chlorophyll fluorescence has also been integrated to such systems, with the first underway flow-through