If it's salty, make sure you ground balance frequently if you move from wet to dry. I found out today that I need to manually ground balance when I get up high into the dry sand. The auto doesn't bring it up high enough on it's own. To give you an example, if I start in the dry sand it auto balances fine at about 24. But if I auto balance in the wet sand at 14, and then head back up to the dry sand, the auto balance only brings it back to about 16. The result of not being ground balanced makes my unit get very noisy and falsey, especially if a bump the sand.
My big revelation today was that I stripped off about 4 bars of sensitivity to counteract the extra noise from accidentally tapping the sand. My concern was that now I am hunting with a weaker prospective. But I tried an experiment. I burried a dime about 8 inches down, and started dropping the sensitivity. Even with one bar, I could still pick the dime up fine. But I had to make sure I was close to the surface. If I lifted the coil a couple inches off the ground I would loose the target with one or 2 bars showing. So I am not as concerned about turning my sensitivity down to quiet the accidental bumps.
Still no targets on the beach in Duck, NC. I thought the recent storm would loosen things up, but I only found a 1/2 penny....it was corroded and missing pieces. Frustrating. I need to find some new hunting spots.