Question for the Barners-I inherited a Furuno FCV-667 Depth Sounder and used it all last year offshore and in. I seem to be picking up structure but I am concerned I am not marking fish. Now this could be because A-I am not on fish, B the transducer is bad. Howveer, I have caught fish and never noticed anything on the screen. I know some guys even see their anchor lines which I don't/ We have had multiple shark hook ups anchored with nothing on the sounder. So my question is should I get new equipment? Maybe just the transducer? Why am I not hearing or seeing the fish marks? Any info would be appreciated thanks guys. Counting down the days!