I have a newly installed Helix 12 G2N SI and while I am absolutely amazed by the quality of the new SI imaging...I lose 2D depth when running faster than about 10 MPH.
Unit is installed on an '05 Crestliner CMV 1850. I can provide pictures of the install if that will help.
This is an upgrade from a Humminbird 1198, never had any issues like this with the older transducer.
Thanks in advance for any help!