Use the beach program and make an adjustment to the sens, it presets at around 75%, turn it upto 80% or a little more for dry sand, and turn it down to 65-70% for wet sand. Once you've done that, turn up the preamp gain one number at a time, re-balance and check stability, once you start to "chatter" back down one number and re-balance.
Be prepared to DIG DEEP. (also note, this will cause a "false" signal where there is a high deposit of salt. that is where the waves stopped before going back down, but it should work really well in the overall wet or dry sand, just not on "the line". The false will be a beep in one direction, not "repeatable" multiple times, as you machine adjusts with the auto tracking. The false will ring in high, close to a quarter reading) Sweep speed should be medium in dry sand and slow in wet sand.
You will find alot more stuff in the dry sand, but more valuable stuff in the wet sand. Go from 1.5 hours before low tide to 1.5 hours after low tide to hit the wet sand and work the dry sand during high tide hours.
good luck