Its not going to read past about 35 or so unless the transducer is in the hull.

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Its not going to read past about 35 or so unless the transducer is in the hull.
My Lowrance will read at 55mph + It just takes time to tune in the transducer placement. No turbulance and full contact with the water is the key. 1/8" can make make a difference.
If you want to verify if your transducer works, and it's not permanently installed at the present location, place it inside the hull at the very back (lowest location) and put enough water inside your boat to cover it. Use common sense. I'm not saying to fill your boat. Then try it. If it works epoxi it in the location. Make sure there's NO bubbles.
Having the same problem with my new Humminbird. Trying to relocate the transducer to cure this.
