It's always best to make a "grid" pattern at every area you hunt. Going in each direction. Sometimes I'll even use two sets of spikes with strings to keep the pattern uniform and to make sure I covered all the ground. Then depending on my coil type I will go over the grid in all four directions two or three times, more with a concentric, less with a DD coil. Concentrics have a cone shape signal that hits less deep targets unless you hit the area more than once. DD's have a blade signal that covers more a area. Say if your swing is three feet wide and you use the stringed spiked area then move one set to the area next to the cover area until you completely covered all the ground. First north and south, then east and west. At the end of the search if you could see it from above it would look like a piece of Grid paper. I also never swing the coil with a curve but in a straight line overlapping each swing moving slowly. I also scrub the ground as close as I can to find the deepest targets, scrubbing also keeps me from curving up at the end of each swing......HH, Woodstock
