The 798c SI Combo NVB features a brilliant color, ultra-high resolution 640V x 640H 5 display, Side Imaging and DualBeam PLUS sonar with 4000 Watts PTP power output, GPS Chartplotting and advanced Fishing System capabilities. In addition, it includes dual card slots for maps and saving waypoints, as well as 3 programmable preset buttons to save your favorite views. store.humminbird.cust.shopatron.com/media/document/NVB_Lake_List.pdf Includes select Navionics Charts pre-loaded. Ideal for the tournament anglers who fish the four Navionics regions in the US.