In the past, I've been able to search around at less than 5mph using my gas motor. The transducer is on my TM and my screen is moved next to the console. My old TM was a 45 mk. Now I have a 80 mk (the setup for the transducer is the same) and that is when a very noticeable wash (at least it looks like a prop wash) can be seen on the DI and SI screens. When I change directions or stop, the screen changes or at best clears up, but if I start up again it will occur again. I tried raising the height of the TM which had some effect but did not fix the problem. Has anyone else had this problem and found a fix?