GMR 18 xHD3 18 Radar Dome Loaded with advanced features typically found on open arrays, this powerful 18 dome radar offers superior traffic, obstacle, and weather detection for peace of mind on the water. Features: 4 KW power output, 48 nautical mile max range Scan-averaging technology Improved target-size processing Split-screen dual-range display Bird detection Quiet dome-drive motor Scan Averaging Technology A first for Garmin magnetron radar, scan averaging helps filter out sea clutter and interference to enhance the detection and display of consistent targets. Angular Target-Size Adjustment Pulse expansion and angular target-size processing techniques optimize on-screen object shapes for better interpretation at all range scales. Faster Scanning Antenna Rotation speeds up to 60 rpm improve the redraw rate for faster target updates. True Echo Trails A historical trail of boats on the water is displayed on the screen, removing relative motion influences to help you quickly identify moving targets and potential collision threats. Dual Range with Overlay A single radar antenna is capable of providing split-screen, side-by-side images on your compatible chartplotter, with independent range settings and controls for both close and long range. Overlay either or both ranges on a chart. Dynamic Auto Gain Gain automatically adjusts levels to optimum settings for harbors, near shore, and offshore in open waters. Radar Overlay See overlaid images on your chartplotter's map screen (with appropriate sensors, sold separately). High-Resolution Radar Pick out targets at a distance thanks to a narrow horizontal beamwidth and