The 598ci HD SI Combo features a Best-in-Class brilliant 640V x 640H, 256 color display with LED backlight. Side Imaging and Down Imaging sonar with 4000 watts PTP power output, Precision Internal GPS Chartplotting with built-in UniMap cartography with a card slot for optional maps along with a Tilt Swivel Quick Disconnect mounting system. The design also allows for drop-in replacement capability for competitive in-dash models. Maximize your angling experience with the Humminbird 598ci HD SI fishfinder GPS system.