When I first started this park yesterday, my detector was going nuts. Jumping all over the place, even with the coil in the air. I changed batteries, no luck. I saw some power boxes on the ground. I moved away (50'). It helped, but still a little goofy. I went to custom mode, 4 notches on the silver end and it stopped. Do you think it was power lines under the ground? Let me know. I had read about overhead power lines causing problems.