Garmin Echo 550c FishFinder With one of the best and brightest screens on the water, echo 550c will redefine color sonar scanning for freshwater fishing. Get the Clearest Possible Picture echo 550c turns fish into sitting ducks. That’s because of its powerful sonar with 500 watts (RMS) power with Garmin’s exclusive HD-ID target tracking technology. A video-quality 640×480-pixel VGA