Sound velocity profile (SVP) data for calibration of the EM 122 multibeam system of RV SONNE during cruise SO265

Four sound velocity profiles (SVP) were conducted during RV SONNE cruise SO265 that took place between 2018-08-26 and 2018-10-11 as part of the research project Shatsky Evolution. A CTD (conductivity, temperature, depth) rosette sampler was used for three profiles and a sound probe for the fourth profile and the probes were lowered down to 2000 m water depth. The data were used to calibrate the ship's own EM 122 multibeam echo-sounder system.