So I am in this park next to these huge power lines and a railroad nearby. As I approached the area near the powerlines my machine started freaking out. In Polar mode the green bar was just a big circle. The machine would not shut up. Is that an indication of EMI? or some other anomoly? I did two things to quiet it down. Both worked. One..I took it out of 3 frequency mode and put it into 22.5 only. It quieted down. I then put it back into 3 frequency mode and put the offset at +3. It quieted down as well but not quite as much as putting it into the single freq mode. I just wasn't sure if it was voltage drop from the batteries, or interferance. I could hit different spots within a few feet and it would go away. I am pretty new to this hobby. First time this has happened. I thought my machine was broke.