Loss of bottom while underway

[Tolock1]

I am having an issue reading the bottom while underway. It happens once the boat hits about 20knts. What setting needs to be adjusted?

I have 2 TZT14's connected to the Dff1-uhd.

Thank you for your help.

Tom

 

[Melville]

If you are only losing bottom at speed it is most like turbulence over the transducer face.
There is no setting that can cure it. Do you have a picture you can post of the display at speed?

 

[Tolock1]

I do not. I will try to get one next weekend when I am on the boat again. I think you are correct, when the boat was out of the water last I thought I noticed the caulk around the transducer needed some work.

Thank you