I also found that I could not find a MICRO Target until I turned the socket head outward (forward/up on keypad on GUI) and rotating the MICRO to face down of course. After I did this I got a target even when I return the head to its starting attitude (with MICRO pointing to ground of course). I tried many different sites inside the orange circle and even a few just outside on the rocks as the circle is described as ROCK but appears to me as sand (no rocks inside the site)
P.S. Love the Christmas decorations in mission control :)