Quote Originally Posted by rnvinc View Post
I would also suspect the motor mount ...

You could further experiment with the transducer on a pole by moving the transducer aft to verify if the lines go away in the SI image ...

If the lines go away at just a short distance aft of the transom, you might could add a transducer mounting board ...

Another option (but more expensive) is buying a second transducer and using the Garmin 12 pin Y cable ...
Using a Garmin Transducer Y-Cable | Garmin Customer Support

This Setup allows left SI to come from a port mounted transducer - and right SI from a starboard mounted transducer ...

Rickie
I already have a piece of starboard it’s mounted to but could double up on it. However when I had it on the pole, I was just holding the pole and it would kick away from the transom some. That didn’t clear it up. Going deeper did though.

I asked Garmin about adding another transducer twice. The first said it wouldn’t work, that you would need to use two different transducers with only side imaging. The other said it would likely cause more interference and problems. I’ve about decided that they don’t really know much because I’ve received all kinds of different advice on the issue and it’s all over the place