my boat is a Tracker Pan Fish 16 ft. stick steer-40HP mercury used mostly on Kaw Lake Oklahoma -which is a relatively shallow lake with some pretty good structure and channels. I'm gonna buy a side image depth/structure locator without NAV. with GPS. I am only looking at the Humminbird 797c2Si. I just can't justify the additional money for the bigger unit and even this one is gonna cost me a new fridge for the house. I'm gonna wire the transducer up to operate off of the front of the boat on a bracket I made out of Square tubing which is adjustable up & down so I'll have clear views off of both sides and be able to raise it as needed. I had this bracket on my other tracker and it works really good. This mounting also lets me get the view/picture about 16 feet sooner than a transom mount. First off--I can live with the smaller 5 inch view but will the 4000 watts be enough for seeing fish on the bottom? and will I be able to see my line or bait under the boat? Secondly--what benifit would I get from the Quad transducer or is it associated with the side image at all. Is the gps antenni built in on some models or are they all outside mounted. I'd really like to hear from a couple of you guys that have used the 797 Si. Are You happy with them or not? are they good units other than the fact their being replaced by the larger screens with more power. also, are the 797s still being made or they now selling off the excess stock? I can't imagine that everyone can afford to go to the 997 or the 1097. I also don't have room for the bigger units---Inquiring Minds wanna know!!