Add stunningly clear Ultra High-Definition ClearVü and Ultra High-Definition SideVü scanning sonar images to your compatible chartplotter. Plug directly into your 8600xsv or ECHOMAP Ultra series chartplotter or use the GCV 20 sonar module to display on other compatible chartplotters. It includes 3 arrays, including a downward-facing element, with frequencies ranging from 0.8 MHz (800 kHz) to 1.2 MHz (1,200 kHz).