Ive seen 2 people ground balance there etrac 2 different ways.The first guy raised the coil exactly 1 foot above the ground and waits for the screen to say channel whatever!The other local guy pushes the same button but pumps up and down up and down until the channel whatever screen appears.Which way is right?And also im wondering if i raise the coil a tad higher in the 45 second ground balancing to maybe 18 inches instead of 12 inches i might possible get a little deeper to find those indians...Its a good question and wonder!Makes sense higher ground balance deeper coins.