Lowrance Mark-4 Combo Base Fishfinder and Chartplotter 4-Inch greyscale LCD 300 Watt 83/200KHz fishfinder Bulit-in GPS/chartplotter w/ basemap Includes transom mount 83/200KHz transducer One year parts and labor warranty Led Grayscale Display Offers Best Viewing Ability In Any Boating Condition Ultra-accurate Internal Gps Antenna User-friendly Features Include Quick-release Tilt and Swivel Bracket, Easy-to-use Menu Controls For Faster, 1-hand Operation Compatible With Navionics Premium and Gold, Fishing Hotspots Dual 83/200 KHz Operation--up To 120 Of Fishfinding Coverage