From my recent experience at the "vault" I found and have been working on to gain entry for several months now, it seems that when you get "close" to whatever it is that was hidden, the markers are almost all close to 33 ft. apart (at least that has been the case around the "vault" I found). When you are close, some markers/carvings will be around 33 inches in size (I found an arrowhead rock this size that was really close to the "vault") and some markers will be 33 paces apart.
Two other numbers that have been important in my area are 4 and 7.
Also, though I have not measured it precisely, the "vault" itself is very close to being a 33 ft. square rock formation (going by eyeball measurement)!
I have found signs in my area as far away as 8-10 miles (including a large heart rock I posted in another thread). It seems that, in this area at least, the signs became more numerous and closer together when I got within three miles of the "vault".