Went out the other day and was having a problem while running the PI in the water had a chattering sound in the headphones was driving me crazy for hours. The machine would not pick anything just chatter moved out of the water same thing. Well after getting aggravated decided to go in. This is what happened and I just wanted to let others know in case they have a similar problem. I got back in my van and my cell rang answered it and then decided to go give it one more try well low and behold no more chatter. The problem was I forgot to leave the cell in the van the PI was getting interference from it when run wide open boy did I feel stupid and relieved at the same time PI was ok.