Yeah, the idea is to have a clean area such as woods, possibly the best ones are comunal, and the coordinates bounce back to the owner who can post them online.
Wow came to me a better idea having a kind of non harmful mortar (pumped air I guess) and each time a user finds the cache they have to shoot it to the air and the coordinates change a few meters (50 m would be ideal) qnd the new coordinates are automatically uptaded on the cache page, the mortar coordinates are the visible on the map.
I'm realising I may be kinda crazy and use my not so long spare time