Navico SS3D SSHD TotalScan Skimmer Transom Mount Bracket [000-12603-001]SS3D SSHD & TotalScan Skimmer Transom Mount Bracket Structure Scan 3D gives freshwater and saltwater anglers a unique, three dimensional view of fish, structure and bottom contours making it easier to understand where fish and structure are located in relation to your boat. With Structure Scan 3D, anglers spend less time searching for productive water and more time catching fish. Structure Scan 3D requires a 3D module with transducer and a HDS Carbon