from time-to-time. The challenges of hunting an ocean beach, compared to any inland location that lacks salty sand and salty water and a mix of both, can be fun to learn. A simple way I view the challenges, and have hunted them (coastal beaches) on the West Coast and in both Florida and Atlantic City New Jersey, is to first deal with any Iron-based Ground Mineralization (using the Ground Balance adjustment) and next to deal with the very low-conductive salts or wet salt.
I adjust for a 'proper' Threshold audio and then Ground Balance the detector for the strata or section I plan to hunt. That is, if I position myself about 100 yards from the surf-line, I GB the detector and then work parallel to the surf line. I try not to hunt toward-and-away from the water. Doing so means I might GB for some different level of mineralization near the edge of the beach which can also be quite dry, then work out towards the surf-line and progressively I might get into a different amount of negative iron mineralization AND start to get into damp sand, then damper sand, then wet sand, and then into the shallow surf zone.
Adjusting for the mineralization might take a little learning because some beaches, even where it is dry down a good foot to two, or even more, can be very mineralized and require a higher GB that other beach environments. Some beaches, like much of Florida, had sand that was much closer to neutral, especially compared with the ground I usually hunt in NW Oregon, Nevada and Utah (with one exception). Florida beaches are much easier to adjust the Ground Balance for, from my experience.
Anyway, once you adjust the GB in the All Metal mode you can determine if the conditions are favorable or not to hunt the beach in a Threshold-based All Metal mode. If so, I often will. However, you can get some falsing at the beach due to either an errant GB, which is easily heard in All Metal mode, or you can opt to search in the motion-based Discriminate mode. That is what I usually do. here is where the next important adjustment is needed.
If you adjust the GB in the All Metal mode so it sound close to correct, switch to the Discriminate mode. Hold the search coil about 6" above the sand and then briskly bob it toward the sand and back up, going to to about