How can PERM-A-SITE help you save time, money and effort? After mounting the PERM-A-SITE to a tree, telephone pole, building or any stationary object and setting out to it, you now have a permanent back site with X, Y, Z. This means, even if your occupation point has been disturbed or you have a bad instrument HI you know about it, fast. So instead of running around giving back sites or running control back to the job site, you can be planning the days work or getting ready to stake out, saving you time, money and effort. The low cost PERM-A-SITE targets off site, so you can easily reestablish you're site control with a 3 position resection. Great for monitoring, w two targets set at 90 degrees =/- you get a positive position and two elevation checks, with one person! Weather proof construction, adhesive backed, and reusable. Patent Pending.