This weekend, I was fishing 43 feet of water, it was some standing timber, on SI the Crappie jumped out just fine. I could tell exactly which trees to go to, and how deep to fish? I had a range of 90 set, 3mph, 455 was the si setting, 1198. I realize this wasn't a school of crappie in open water, and maybe that is what you are referring to? Usually I can tell if they are keeper size or not on my FF. I think on mine they show up at a big enough size that even if the tree wasn't there I can see them.