I did read the book about pinpointing but because of old age, forgot most of what I read. One thing I did remember was the picture of the shape of the area under the coil that is detected. Like all of us, I first get a hit while swinging east and west. I narrow my swing to a few inches and effectively pinpoint the east/west location of the target. Then.I move my coil slowly north and south. I pay close attention to where I first hear the tone and to where it dies off. Unless it's a buried can or something bigger, the target is just inside the outer coil ring where you first hear the tone going north and south. I very seldom dig a hole bigger than 3-4 inch diameter.