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One transducer provides the highest resolution scanning sonar images available and amazingly clear high wide CHIRP traditional sonarHigh wide CHIRP traditional sonar provides remarkably clear target separation and definitionCompact, all-in-one design includes transom and trolling motor mountsCompatible with GPSMAP® 8400xsv/8600xsv and ECHOMAP™ Ultra chartplotter/sonar combos GT54UHD-TM ClearVü & SideVü: Two SideVü sonar frequency settings (455/1200 kHz) provide options for extended range of up to 500' and up to 200' below your boat with 800 kHz ClearVü sonar