Simrad StructureScan 3D Transducer - This Skimmer transducer works with the StructureScan 3D module (sold separately) to create a high resolution, three dimensional view of underwater terrain and fish-holding structure. The included bracket enables easy transom or step mounting, and jackplate or flush-mount step installation are also supported via optional mounting kits. StructureScan 3D imaging transducer Scans up to 180 metres (600 feet) to each side of your boat Supports transom, step, or jackplate mounting