Strategy for the concealing and the revealing of letter / number combination

On a macro scale, from a distant aerial perspective, my letter/number combination (U9) takes a number of forms. The main island formation is in the shape of a U, with the number 9 appearing within this formation. There are 9 small separate islands scattered around the U-shaped landmass. There are also 9 rocky peaks on one end of the island. As we approach the main bay from the air there are 6 large rocks in a U-shape, and next to them, a small island in the shape of an inverted 9. On the tallest island outside the main landmass, on its snowy peak, stones protrude from the snow in the shape of a 9, and above it are smaller rocks in the shape of a U. As we approach the micro scale, on one of the beaches within the bay, some rocks, barrels, buckets and lobster traps are left on the beach  making up the letter and number U9. On the micro scale on a flat terrace above the helicopter base located on a small shed and illuminated by a neon light is the shed ID which is none other than.....U9.