The Humminbird 409640-1 HELIX 5 SI/GPS Combo incorporates a brilliant 800H x 480V, 5″ 256 color show with backlight. Aspect Imaging/Down Imaging and Twin Beam Plus sonar with 4000 watts PTP energy output, Precision Interior GPS Chartplotting with built-in UniMap cartography with a micro SD card slot for optional maps or for saving waypoints. Maximize…