Oh, boy!!! Amen to that statement. Even after owning the Quatro, for over a year, and reading Andy's book 2 or 3 times and studying it and practicing it. I went to a local beach and almost lost my mind one afternoon. All I heard was high pitched tone after tone, with high numerical readings. Sounded like a meteor shower had hit my detector volume or something. I honestly got so freaked out, I thought the detector had gone bad on me, so I went to another stretch of beach in a different area, and it was just fine. I was able to discern what was going one. After I thought about it for a while, I remembered that I had dug in that "crazy" beach before and found almost nothing but melted aluminum cans. That beach is notorious for party goers, who build huge bonfires, and probably throw their empty aluminum beer or coke cans in the fire. Of course a big chunk of aluminum is gonna have a high reading, so I think that was the case. The Quatro, wasn't broken, I just wasn't reading it right. I agree with Golden, start out in an area where there's not too much trash. It'll make life easier for sure. Marc Trainor.