Just a question. I bought last year and just sold an HB DI unit. I used it on the Chick mostly in shallow water [under 20'] and most of the time in split with the 2D SwitchFire. After using it for awhile I came to the conclusion that, because of the way the DI signal is presented in MOST cases, it is of little added benefit. I had believed when I purchased the unit that it would give me a picture of what was "around" the boat and not just what was under it. In shallow water, that is not the case. It does cover a somewhat wider area than the 2D BUT because it scroll from rt. to lft. like the 2D, objects cannot be pinpointed as to their position relitive to the path of travel. If you scan something that is revealed to be a treetop, stump or brushpile, the only way to know with any certainty where it is, is to run back and forth and scare any fish or fan cast till you make contact. To me, the only way to enhance its usefulness would be to make it function more like SI and scroll from top to bottom. At least that way you could tell the objects position as related to boat path. Just my thoughts and opinion!