New Humminbird 525 buddy put on boat I just bought from him. Transducer is mounted on back of boat. It works right when running down the lake, but when fishing it will show depth right & then sometimes is will go to 1ft. for no apparent reason. It is mounted on a Sprint 255 at the back of the boat. I moved it up a little & it works good when running down the lake now , but still acts up when fishing sometimes. Before it was throwing water when running down the lake, now it doesn,t. I would like to know exactly where to mount it to get it to work right when fishing. Thanks