Last night I was doing a 45-minute hunt right before dark, and while expecting nothing, hit a couple of IHPs in an area that had never yielded coins for me before. First Indians in close to a couple of years; it was pretty dark out before I left. I had today off so of course I headed back to the same spot. When I got there I realized I had no pinpointer. After searching the car I started walking the field and luckily found it by looking; I was getting ready to sweep the field with my detector. I decided I should see what it rang up as for future reference with all the fall leaves on the ground, and to my surprise, with my Nox 600, I got pretty much no response when I passed my coil over my Garrett Carrot. I had to turn off iron discrimination to really get a signal. It might be worth checking yours... my Carrot has a talent for getting lost and that's something that can spoil a good hunt.