Humminbird 597 ci HD DI readings at speed

ricohman

Lieutenant Commander
Joined
Jul 30, 2011
Messages
1,631
I've got my new 597 ci HD DI unit mounted and I've used it twice. I am still breaking in a new engine so I don't go much faster than 30mph or so.
At all speeds it reads depth fine but at any speed above 15-20mpg the traditional sonar view fills with "noise". The DI view is more stable and I've moved the transducer down a bit and it doesn't seem to help any.
What should my expectaions be of this unit? Maybe I am thinking it should display a crystal clear reading at all speeds?
It works fabulous at trolling speeds and putting around.
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