ok the way I understand it if you put it in all metal, sensitivity as high as you can and put on auto track. Wouldnt that set the ground balance automatically to the beach sand , wet or dry? not for sure how to even put a 70 in beach mode. I dont seem to have any problems with falsing or finding deep targets wet or dry. the xterra 70 has always been very stable for me at the beach not in beach mode. I use the 5x10 hf coil always.