I would appreciate any advice on how you all use your sonar to find structure and fish. I have two on the boat that I use. One is an Eagle ? the other is a Humminbird 565. I have fished areas that show fish with no bites and I have caught several from directly under the boat and they never showed up on the finder one was 32lbs. I have read and reread the manuals and am sure that they are installed correctly. What am I doing wrong?