Yesterday evening started out great found brush piles with fish finder as usual everything going great caught 30 crappie in one hour Little bit later decided to head to a cove and try for some catfish, didn't do anything unusual. Got tired of that and headed back to brush piles but when I got there couldn't find them (although I have found them dozens of time in this spot before) on the FF and there was a huge amount interference on the FF. Thought the water must be in bad shape so headed to another part of the lake where there was less wind hoping for better water. When I got there same problem with the FF but this time it was even worse with long vertical lines going across the screen, huge amounts of "stuff" in the water that shouldn't be there.

What in the world happened? How do I debug this?

Sequence of events:
  1. Motor to spot, FF is working great I'm seeing fish and brush piles wonderfully
  2. Motor to cove and fish for a while
  3. Motor back to brush piles and FF lost it's mind


There's really nothing that happened before #2 and #3. I tried reseting the FF to factory defaults on the water, no help same results.

This is a Lowrance Elite-4 Chirp. I don't know where to start. Transducer and wiring looks fine. Did the transducer break or the head unit?