Continuous in-situ water quality monitoring methods have developed quickly during the 21st century and a wide selection of instruments for monitoring of different water quality parameters is now available. The usability and reliability of these devices is good and they provide new possibilities for oceanographical and limnological studies. Since 2006, we operated a buoy-based vertical profiler, which allows fully-automated collection of water quality data from the whole water column. The profiler station is situated at the Finnish SW coast in the Archipelago Sea, Northern Baltic Sea. Data of six different water quality parameters (temperature, salinity, dissolved oxygen, turbidity, and chlorophyll and cyanobacteria concentrations) is collected four times a day from the whole water column during the ice-free seasons. Through continuous in-situ monitoring and remote data delivery we have been able to follow dynamic hydrological and biogeochemical processes in detail. The profiler has been in full operation since 2011 and during the six years of high-resolution monitoring we have collected up to 17,000–39,700 readings per parameter per season. The collected data has revealed many details on the dynamics and interplay of biological, chemical and physical processes. On the basis of six years of experience, the buoy-based vertical water quality profiler has proven to be a reliable and practical tool when accurate information about fine-scale dynamics of water column processes is needed.