HOOK-3x features Broadband Sounder™ and Advanced Signal Processing™ for optimal fish-target separation and noise rejection, while HOOK-3x DSI features DownScan Imaging™ to give clear, photo-like view of fish-holding structure beneath boat. Combining fishfinding technologies with daylight-viewable, color LED display, IPx7-waterproof fishfinders come in optional All Season Pack with suction-cup mountable Skimmer® transducer for small boat applications and ice fishing transducer.