Once you get a good target signal in trash, wiggle the coil over the target ever so slightly as you back away, waiting for the signal to go away. The target is at the tip of the coil. Do it in two directions to get a better fix. This is necessary when coin sized targets are mixed with ferrous and other larger trash, and traditional pinpointing is impossible. There are vids on how to do this out there, just google around. Its a necessary technique, IMHO, for using the E-Trac.