[jorluivil]

Funny that you should post this.....today while fishing I was in 55' of water and I knew that I was about to hit a shelf and immediately go to 80'. As soon as I got close to the shelf my 350 showed 9' and bounced around between that and about 25'. I had no doubt that the area I was in was a minimum of 80', its impossible for this area to be 9'. I powered the unit down, turned it on and it still showed a depth that was not correct. I ended up leaving it on straight GPS for about 2-3minutes, when I switched back to the sonar mode it showed 82'. I have no clue what caused this to happened and its never happened before so I'm as stumped as you are.