Garrett atx pi 12+20inch coil, Garrett mh series, Garrett 2500+t-hound attchmnt, fisher tw-6 two box, Pulsestar pro ii with various coils up to 98 inches, pulsemaster pro w/1.2 m coil
I think most who have dug somewhere, would like to know if a good buried marker isn't found by about 2-3 feet if they should totally abandon the dig... or if there is still a decent chance they are on the spot anyways.
Nobody knows what these guys were thinking when they buried it. But, some knowledge of others digging spots might help.