What is a List of Competencies ? A DSV is in my opinion a OSV housing 60 to 120 persons ,so your Hotel,Resturant and Contruction site. For Last 10 years I’ve run mostly OSV’s that are being used as DP 2 ,Sat Dive vessels(4 years) ROV (jobs Pipeline,cable burial 3 years) and Seismic OBC as cable layer and Data Vessel (2 years)