I have an HB 998 si hd unit and I have interference while running my I-pilot they were connected to same battery , so I unhooked it and put them on different batteries the batteries are side by side and it didn't help with I-pilot running I still get the lines . Ive read the entire sticky on interference and im gonna try the the ferrite data line filter are there any other options , will moving my batteries one in back of boat and one in the front help . I had to add some wire from my HB to the battery will the longer lead mess me up ..thanks for reading ...