Ok, I know that the depth is calibrated to coin sized objects, but I have noticed that when I'm scanning a target I may get a 4 or 6 inch depth indication on a target.When I go to pinpoint the target, I get a 2 inch depth indication.When I dig the target it seems that it is in the neighborhood of the depth indicated when scanning(4 to 6).Anybody else experience this? How accurate is your depth indication?