I tried my XS out yesterday at a cellar hole. I was using Quickstart, cleared the screen as was suggested and ran Iron Mask at 15. All I got was a bunch of noise, so bad that I went back to the Factory Pre-Set and left it there. I got quite a bit of nulling, so much that I barely got a threshold sound at all. I know when the detector is nulling, it's not picking up a signal. I'm a little confused about Iron Mask, is this a setting all it's own with it's own screen? I have been adjusting the Iron Mask and going back to the Smart Screen, does this cancel Iron Mask and put the machine back to Discrim. mode? The manual is not very clear on this or maybe I'm just not getting something right. In the fields, I have had no problem with this machine, but hunting cellars has been frustrating. Ron