Elite-7x HDI Fishfinder with 50/200/455/800 Transom Mount TransducerHybrid Dual Imaging (HDI) - The power of two award-winningtechnologies combined to provide the best-possible view beneath your boat.Broadband Sounder -- excellent for marking fish arches and trackinglure action -- PLUS DownScan Imaging that reveals easy-to-understand,picture-like detail of structure and bottom with no interpretation needed.70% Larger Elite Color Display - Brilliant, widescreen visibility andviewing detail in all conditions.Now With DownScan Imaging Overlay -- Exclusive technology overlaysDownScan Imaging onto Broadband Sounder display for one stunning view thatseparates and clearly exposes fish targets from surrounding structure.Overlay transparency and color palettes are fully adjustable.TrackBack Into Sonar History -- Immediate scroll back in sonarhistory to review covered areas and pinpoint spots (saves time and fueltrying to re-trace your path). With chartplotter models, simply mark awaypoint at your cursor location with the press of a button.Proven ASP (Advanced Signal Processing) - Reduces manualadjustments to automatically see fish, structure and bottom detail moreclearly.HDI Transducer Options -- Broadband Sounder (83/200 kHz) plusDownScan Imaging (455/80 kHz) for depths to 1,000 feet, or Broadband Sounder(50/200 kHz) plus DownScan Imaging (455/800 kHz) for depths to 2,500 feet.DSI signal features a maximum depth capability of 300 feet. Elite-7X alsoworks with traditional 83/200 kHz and 50/200 kHz Skimmer transom-mounttransducers. All Airmar transducers used with HDS are also compatible withElite-7X series. Transducer Type Transom Mount Waterproof Rating Waterpr