fish finder

[tlspyder13]

I have the Humminbird 575 and can pick up a swivel on my line. A couple of things. Your 20 deg center cone is only looking at a 5.3ft circle at 15ft. Your outer cone is only looking at about a 15ft circle. Unless something is right below your boat it isn't going to show up at that depth. Also if the transducer isn't flat it can really mess with how well the finder works. Ice fishing has shown me how big of a difference having the transducer flat or almost flat does.
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