Hydroconsult had the pleasure to perform the calibration of the bathymetric acquisition system of Ship As A Service (SAAS) marine and subsea services company : a portable & flexible survey solution fitted on the Sterenn Glaz for these sea trials. Our team was asked to check the repeatability of the patch tests over time. A suitable area with the presence of a wreck located to the east of Saint-Michel Island (Lorient Harbour) was previously selected by SAAS. The acquisition of the data necessary for the various patch tests was carried out by following 3 parallel profiles, surveyed in both directions. All navigation data were post-processed with the Qinertia software.