The problem most people have is that they try to use the All Metal mode's GB control to cancel out the low-conductive wet salts. In trying to do so they end up with a too negative GB setting and this results in annoying falsing in the Discriminate mode.
Things to remember are:
► Do not hunt towards and away from the surf line. That moves you from dry sand to wet sand, and thru different deposits of varying mineralization. Work <EM>with</EM> the surf line in order to stay in the same/similar mineral strata.
► Set the GB in the most <EM><STRONG>negative</STRONG></EM> mineral strata you can find at that particular beach. Sometimes this will be way up high on the dry sand, but it is quite often out in the <EM>damp</EM> or almost damp zone, but before the real wetted salty sand. An area where there has been a good deal of deposition of more mineralized sand.
► Once you have set the GB for the most <EM>negative</EM> ground at the beach, leave it alone! If you move on out into the wetted, salty environment, it isn't the GB that needs adjusting, it is the Discriminate level. Bob the coil towards and away from the sand, going from about 6"-8" down to about