dig clean hits that don't growl to iron, if you get a strong hit, raise the coil about 6 " and if it still hits strong--keep walkin'. quick way to tell if an 80-82 hit is a dime or copper penny is how small the footprint is. dime walks off fast and penny will drop off slower. I do the "wiggle" pinpoint method-- when hit ends as you wiggle coil towards you the target is directly below the front tip of the coil. the ATPro can be mastered fast-- run in Pro Zero at 2 bars down. short slow swings and hover all hits to eliminate anything under 46 unless you like tin foil and iron. know the site-- a 61 can be a pulltab AND a roundball. 67 can be a bottle cap AND an IH. practice, dig, learn, repeat_______