I have a HB 999. I spend time looking for fish each time out. I'm pretty good at finding fish in 12' of water or deeper. I still can't figure out how to find fish shallower with the SI. So in 12' or deeper I don't fish unless I see fish. Shallower than that I look for structure and fish it. I wish someone had some pointers on how to find shallow fish out to the side of the boat with an SI unit.