ED Matthews put this group of hunters together in the late 90's to compile these results. Interesting, but only good if you happen to be hunting this beach only, ..I've hunted beach's up and down the east coast of the US using the same detectors and results from one beach to the next can vary because of the Matrix of the Sand and Salinity percentage of the water. Just my opinion, but of resent I'm seeing now temperature seems to affect depth also, as far as your settings on how far you can push them for the best results..And this could be because different seasons bring changing salinity conditions? So what works well in one place, maynot do as well at the next. And that can go from Coils, scoops, detectors..etc..