you should hit it; it’s just too low priced…there is no guarantee you will catch fish with it, but it’s good to know that you aren’t dropping line on where you know there isn’t any, that is the real benefit of a unit like this…and it’s also nice to know the depth…
either spend the $25 here (and i’ve never seen a fish finder this cheap) or spend $150+ on a real nice sonar (like the Hummingbird models; i got one)…