Sorry, the Vaquero is a single frequency VLF detector running at 14.3kHz, so it sucks in wet saltwater sand just like the AT Pro or Tesoro Lobo Super Traq. Your best bet is to run iot in ALL metal, sensitivity as high as you can without chattering, and hope for the best. Run the ground balance just a hair negative (when you raise the coil the signal gets stronger as you ground balance - as opposed to getting stronger as you pump the coil down to the ground or positive balance).
In the dry sand the Vaquero is the ultimate killer! Supertune that sucker, set your discrimination just below nickel, and get some!
Saltwater Beach Detecting 101: Will One Detector Do It All?