We have a 2004 33' grady. We have an inhull transducer with a simrad EVO 2 I believe. We mark fish sometimes, but they are not the typical tuna marks and it is spotty. My electronics should be a bit better I feel. I have heard that a inhull is just as good as a thru hull, but was wondering if people agree or disagree with that. And if anyone could think of a different solution. Thanks