Humminbird 997c Combo: Breakthrough side - imaging sonar, full - function GPS navigation and BIG 8" brilliant color viewing. It's a revolutionary performance in fishfinding systems! The 997c SI Combo delivers it all with breakthrough High Definition Side Imaging sonar for picture-like images of the bottom, precision GPS Chartplotting, and a no-compromise ultra wide, high resolution 8" screen. Feature packed and user friendly: Brilliant, 8" 256 Color TFT, sunlight viewable color display with 480V x 800H resolution; Revolutionary 800kHz Side Imaging sonar technology with 180 degrees of coverage and dual frequency 83 / 200kHz sonar in one transducer; 16 channel WAAS / EGNOS GPS receiver included... 3000 Waypoints, 50 Routes, 50 Tracks with 20,000 Points each; Built-in UniMap of the USA coastline, inland lakes and rivers to 30 meters per pixel resolution; Compatible with Navionics Platinum Charts featuring photo overlays, 3D viewing, and port approach ariel photos; Tidal graphs and port services information available with optional Navionics Gold Charts; 4000 Watts PTP, 500 Watt RMS Standard; 8000 Watts PTP, 1000 Watt RMS Maximum Power Output*; Sonar Coverage: 83kHz: 60degrees @ -10db, 200kHz: 20 degrees @ -10db, 455kHz: (2) 86 degrees @ -10db, 800kHz: (2) 72 degrees @ -10db (180 degree Total Coverage); Two memory card expansion slots to save Screen Snap Shots and view optional cartography; Dual microprocessors, graphics co-processor and triple channel sonar transmitter / receiver deliver fast, smooth operation; Sonar / chart recording to SD card and on-screen playback; Full screen chartplotter, 3D bird's eye view chartplotter and split screen sonar / chart with adjustable split; Programmable view presets access important screens with one touch; Plug ; Play compatibility with InterLink Network Connection, CannonLink Downrigger Control, WeatherSense Barometric Pressure, and Wireless Sonar Link Fishing System Modules; Fresh and saltwater set up options for optimal performa