Humminbird 4089901  581i HD DI Combo Down Imaging and DualBeam Fishfinder and GPS
Humminbird 500 Series 581i HD DI Combo GPS-Sonar DualBeam PLUS and Down Imaging fishfinder with Side Imaging.  Thanks to best-in-class HD screen resolution, incredibly clear Down Imaging plus dynamic SwitchFire Sonar, you won't miss a thing.  Timber, rocks, even fish-watch it all take shape on crystal-clear, 5 inch monochrome display.  Find your way using built-in UniMap or up the ante with optional LakeMaster and Navionics cartography.  Get all this technology in a convenient in-dash mount, or use our Tilt and Swivel Quick Disconnect Mounting System.  Versatility makes the 500 Series perfect for a wide range of boats.