It was only a few short years ago if you could find bottom at a thousand feet, you had the best money could buy. Then Chirp happened, and the technology limits are not even fully explored yet. The screen shot of the Garmin GSD 26 sounder module painting bottom at 17,624 feet is just the beginning. To read about this, and see more screen shots, click here to see what Ben Ellison at Panbo has to say. And read the Garmin Blog about it