Hey guys. I have a question/problem. I.have a hb 957 hooked up to my terrova with universal sonar transducer. And i am getting interference. It will go from reading accurately to jumping all over the place. Andthen it will be fine again. I have it hooked up to interlink to a 997. I was wondering if.there was any specific settings i should have it on. Iv tried everything i could think of. Thanks guys