I'm using mine in fresh water and getting incredible depth with it. I have it set up on a scuba shaft. I have to turn up the threshold more than I would if I was above water but still just loud enough to hear the faint hum. The pulse delay I set at just past the on position and the gain at the preset mark. I find that sharp, loud responses are shallower items, double blips are bobby pins, and the faint, slight rises in the threshold are the deep valuable items. I really like this machine and find it more stable than the surf PI pro that I had. I find that the machine will false when I fan water or sand over the coil a little bit when I'm on the bottom, but this is not a complaint, just an observation. Also, the machine will float like a cork if I let go of it but with the finds I'm getting, I'm not complaining! I would definately buy this machine again. Again, these are the settings that I'm using in fresh water on my lake. If you're in salt water, they may have to be different.......