I've hunted the beaches in Del and Jersey quite a bit....
in the dry sand, you dont really need to do anything any different than you would in your home dirt..........
I run the sens at 95 or so with NO ill effects, and long as the sand is DRY!
I also do a lot of back and fourth between the wet and dry, and again, dont have to tweak the sens at all. What I DO have to do is dial in more disc in the wet sand, and go to maybe De mode instead of JE mode(my preferred mode at the beach). JE WILL net you more lower conductors, like small gold than DE will. (its intended purpose).
Take the machine....turn it on and set it to JE mode, 90 sens, and 6 disc. Hold it in the air at waist level and see if its quiet. (Do a quick fast grab first). If its quiet, then your good to go. If its noisey in the air, but gets better when you lower it to the sand, you have external interference.(will need to bump the sens down...and maybe use De instead of JE) If its quiet in the air, but is noisey on the ground (sweeping), its likely reacting to the salts, and you'll need to bump the disc up till its quiet. I seldom ever have to go above 21 to achieve this. I NEVER have to reduce sens to make my F75 quiet at the beach, UNLESS its RF interference causing the interference.
Be aware that you'll probably not be able to fast grab in the wet sand, but you will be able to manually GB it.
As I said....as long as you stay in dry sand.....you can run it just as hot as you can at home. Detune it for no reason...and you'll lose sensitivity to real small gold. the key to making 99% of the VLF machines out there stable at the shore (especially in the wet sand) is discriminating out the salt.
