Built a new boat and made changes:
Added a 24 volt Ipilot
Installed my 898 SI
I have had the boat out on the water 4 times
I noticed when fishing marks that ran across the 20 foot line
After some thought, it only appears when the Ipilot is running
I am wondering since my 24 volt is not on same ground plane as the 12 volt Humminbird
My old system had a 12 volt Ipilot and same Humminbird with no marks at 20 fow