I have a HDS12 Live and a HDS 9 Live that have intermittent horizontal lines at the surface on side scan images. A background. I purchased the new HDS12 Live and mounted it on the console. I moved my old HDS 9 Live from the console to the bow. I updated both with the 22.1 update. I rewired both units directly to the battery by running 6AWG from the battery via a resettable breaker I use for a switch to a Blue Seas fuse block at the console. I connected the HDS 12 Live directly to the fuse block at the console. I ran 10 AWG to the bow HDS 9. The HDS 12 at the console is using a 3-in-1 transducer mounted on the transom and the HDS 9 at the bow is using a 3-in-1 transducer nosecone on the Lowrance Ghost trolling motor.
The HDS 9 did not have these lines last season, and the HDS 12 is new so it was the first time on the water. The lines appear whether the big motor or the trolling motors are running or not. It doesn't matter. I don't know if the 22.1 update caused it, as I was only able to get the boat in the water yesterday and test everything.
If anyone has any clue of why these are appearing, please help. Please see attachment for a picture of what I'm talking about.