I deviated some, on the way I'd normally mark things. Usually on land, the outline circles will be shallow targets from surface down to 1-2 ft deep. In the water around shipwreck sites, stuff often will be covered with overburden, a few wreck sites they must get down 7-8 ft. Here the largest circles were main hits, depth was not a factor. Around Florida you find places where renourishment of beaches is common (or a dunes project) the original shipwreck beach could be 10 ft down. Am I correct in assuming this site, is probably up the coast farther to the N?
Anyway, in dowsing the site here, I wasn't concerned about small amounts of treasure or isolated caches, only main load which isn't specifically defined but rather scattered.