I owned a couple of boats from 2001-2004. I fished below Pickwick Dam 5 days a week back then. I would sit on top of structure crappie fishing pulling out plenty of fish. I found that structure with my sonar and would keep it on at all times. If it ever bothered the fish I couldn't tell it. I also used on a Humminbird back then a transducer that was called Wide Side. It was same as sonar signal but it shot straight out to the sides. Was very useful for shooting docks. It never bothered the fish either. This is my observation but I don't think a sonar scares fish at all. If you read up on ice fishing you will see that the sonar is as important as the fishing gear. I have always wanted to watch a fish hit the jig on the sonar like the ice guys do.
Regards
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