Welcome to Tnet,,
I hunted Myrtle Beach, Virginia Beach, .and Tybee Island last year. At this time of the year, watch out for dehydration. Make sure you carry a water bottle.
Hit the beach at the Crack of dawn and/or a few hours before the setting sun. I don't think your machines will do well on wet sand. Salt is a conductor and will create a lot of "Ghost Signals "
There are a few piers at Myrtle. Walk the dry sand from pier to pier. Pay attention to the entrance/exit
areas. Many of the hotel resorts put out beach chairs at what we call the "Towel Line." Hit those areas.in the evening after the hotels pull in their chairs.
Don't hunt during the heat of the day. That time is reserved for a nap. Stay hydrated and above all,, enjoy yourself.