HD SI Combo features a Best-In-Class High Definition 640V x 640H 5" display with LED backlight, Side Imaging, Down Imaging and DualBeam PLUS sonar with 4000 Watts PTP power output, GPS Chartplotting with built-in ContourXD map, and advanced Fishing System capabilities. In addition, it includes dual card slots for maps and saving waypoints, as well as three programmable preset buttons to save your favorite views. Maximize your angling experience with the Humminbird 798ci HD SI Combo fishfinder GPS system.