i just put a hb 898c si on my boat , it is awesome, the gps feature is very nice and side imaging is well worth the extra money , you will be able to find your sunkin brush piles as well as everything else that is there for fish to relate to , you will be able to save the location of anything you see on the screen out to 240 ft left and right of the boat then go to that waypoint and look it over with down imaging and regular sonar, yea i spent more than i wanted to but after one trip out i was over it and happy with my decision, brian at bbg marine.com gave me the best deal. not sure about all the models but on mine you can connect two transducers thru a switch , then just toggle the switch from front to back , you could just use a hand held gps tho to easily find YOUR brush piles