The 997 loses bottom at higher speeds (over 35 MPH) on my boat. But I knew that going in, so I also mounted a high speed transducer on the other side of the boat with an A-B transducer switch on the dash. Real easy and the high speed trans was only about $60. Can't remember what the switch cost. Use wafer board to mount the transducers, makes it easy to move the transducers around a bit without drilling additional holes in the boat.