what type of EPIRB do you have? is it a auto release , if auto, how deep does it have to sink to release? Will your boat sink that far? Most Grady will sink and just float a few feet below the surface with some part of it afloat, unless it burst into flames,then it will burn to. I would mount it close to were you can get to it when your jumping ship, next to the life raft or next to the helm.