I just installed a 998 on my stick steer. Put transducer on the TM and kept my 788 on the stern as it does a good job of reading depth underway. When fishing I can use it to navigate to old waypoints, on 2d to see what is at back of boat or both on split screen. Then use 998 at full screen. Works okay except in sharp turns which will distort your sidescan. If your eagle is good at reading depths at speed, I would use this set-up and see how you like it before popping for an 80$ switch and 250$ 'ducer.