That’s normal. When these new humminbird transducers get at decent speeds they lose bottom. People live with it or get a shoot through hull transducer which you can’t really do on a pontoon.
IceNitro LIKED above post
[QUOTE=rnvinc;3670983]Air is getting under the xducer causing the Sonar to lose bottom .
You can try tilting the back of the xducer housing down a little and/or lowering the xducer housing ...
Rickie[/QUOTe
The transducer probably sits 18 inches under water but I will try lowering it and tilting it down.