I bought a lowrance elite7 chirp Down imaging, if I had to do over again I would go with a Side imaging unit instead. reason is all depth finders already have a basic down imaging, sure it isn't the detail image of chirp down imaging but you get a general idea what is under you. add side imaging and you can cover a lot more area. also would agree about mounting a side imaging on the boat vs trolling motor, downing imaging best suited for trolling motor use.