I tried out all the range choices, as well as gain, and some of the other features. The only downside for me so far is actually getting it to transmit. You have to remember the sequence or start over, at least I do. Not real intuitive for me. Unless someone knows a shortcut after warmup. It was clear out when I was practicing and I could visually see boats ahead and within 200 yards or so I could see them on the screen, but they were much stronger and greater distance from the sides. All in all, a pretty nice unit. I mounted the screen suspended from the shelf, and it tilts up out of the way when not in use. I also noticed it likes the amps.