Mark-4 HDI 50/200 - 455/800FishFinder/ChartplotterThe easy-to-use 4.3" fishfinder/chartplotter w/ Hybrid Dual Imagingthat combines Broadband Sounder with DownScan Imagingtechnology, a super-bright, LED-backlit grayscale display, built-in GPS antenna and high-definition mapping.Key Features:Lowrance-exclusive, brilliant, high-resolution, 4.3" , LED-backlitgrayscale displayExclusive Hybrid Dual Imaging (HDI) - Broadband Sounder plusDownScan Imaging -- the power of two award-winning technologiescombined to provide the best possible view beneath your boatHighly accurate, built-in GPS antenna plus a detailed U.S. map featuringmore than 3,000 lakes and rivers and coastal contours to 1,000"Optional chart upgrades include Lake Insight and NauticInsight PRO and HD, Navionics Gold and HotMaps Premium,Fishing Hotspots PROCreate your own map from real sonar data that you record with InsightGenesisDownScan Overlay technology overlays DownScan Imaging ontoBroadband SounderAdvanced Signal Processing (ASP) reduces the need to manually adjustsettings to see fish, structure and bottom detail more clearlyTrackBack to review recorded sonar history including structure,transitions or fish targets, then pinpoint locations with a waypointEasy-to-use page selector menu with quick access to all features usingone-thumb operationMulti-Window Display lets you quickly and easily choose from pre-setpage layouts -- including a three-panel view with chart, Broadband Sounderand DownScan ImagingNMEA Output: NMEA 0183Supported by Lowrance Advantage Service programSpecifications: OverviewDisplay Size: