Sheessh can't you just relax and hope to stumble upon it some day without circling on tiles with specialized build??
I don't think we should give away details about mechanics of treasure locations.
If it can be found everywhere on WM, then no need for it. But if it is in some area, like the Gauss Pistol was, then you should give us a hint. (If the latter is true i think it would be better to make it a quest or riddle of some sort. Its better than farming in 4 squares.)
I was wondering, why i never found a special encounter and some found it many times. Then someone told me, that i need to search in specific location.
I know, that by revealing mechanics you can spoil the game. But on the other hand, player should have a way of determining whether he has a chance to succeed or not. Whether something is good for what he wants to achieve or not.
For example im still not sure, whether the chance to encounter something is affected by outdoorsman and outdoorsman related perks which increase WM speed or not. I think there is a roll performed on every step (red dot on WM) whether there will be encounter or not on that spot.