If the issue are tent stakes/lag bolts which get buried under surface, clear solution would be metal detectors available to borrow/rent (or brought by each camp). Also probably could do a drone or ground robot with a metal detecting loop on the bottom.
Or just count them before and after. Know how many you're supposed to bring home.
The best solution I know of is to get three-link segments of chain and put one on each screw as it goes into the ground. That not only marks the spot, it also gives you a flexible attachment point which is useful in all sorts of situations. (Two links would be pinned in a stationary fashion.)
Biggest problem is it’s a pain in the ass to chop up all that chain, and nobody sells them in pre-cut lengths.
Closest I've been to losing vision in one eye was creating these 3x chain links for Burning Man.
Naive thought: I could use a large bolt cutter to cut chain links. Started trying to cut a link, felt it was sketchy, went and put on some safety glasses.
Restart cutting (had these bolt cutters with like 1m long arms), apply full force, jaws slip a bit on the chain, jaws bite hard. Chunks of steel fly into my chin and face, metal chunks embedded in chin, cracked safety glasses. Dodged a bullet.
Ended using a small welded up jig so I could stretch the chain and then use angle grinder to cut the chain links. Still sketchy, but no flying metal chunks.
Wish I had a plasma cutter.
The Org should make a deal with a manufacturer to produce some huge bulk quantity of these and just sell them pre-cut to camps.
I had a Home Depot employee cut them for me before purchase, they have a big thing that does it with no effort at all.
Could use one of those metal detecting car trailers used in meteorite search, that might map out things pretty quickly
I can't find it right now, but I think it was used in deserts in the US or Australia
The problem isn't that there aren't solutions, the problem is getting everyone on board