You'd be surprised to know that there probably is something there but you didn't see it. Try recording and using humviewer to make a file to view "offline" then see if you can see anything in your scans. Also try searching You Tube for videos on how to set your settings to see the most while you are on the water. I have an 899 and used the videos to set mine to my desired settings. You would have to play with them to see how you like them.