The 398ci SI Combo features a brilliant 320V x 240H, 3.5" 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 and saving waypoints along with a Tilt & Swivel Quick Disconnect mounting system. The design also allows for in-dash mounting with option kit. Maximize your angling experience with the Humminbird 398ci SI fishfinder GPS system. Display: 3.5" diagonal, 320V x 240H, 256 Color TFT. Cartography: Navionics Compatible, LakeMaster Compatible. Memory: Waypoints: 2,500, Routes: 50, Tracks: 50 w/20,000 points each. Sonar: DualBeam PLUS, 200 kHz / 20deg @ -10db, 83 kHz / 60deg @ -10db, Depth: 1500 ft. Power Output: 500 Watts (RMS), 4000 Watts (Peak-to-Peak). GPS Features: Precision GPS, Trackplotting, Chartplotting, GPS Speed, Humminbird UniMap.