Perimeter Grid Calibration

Boot soles met cool red paving at 10:39. Horizontal clearance confirmed. The foundation wall behind me rises sheer, but the paved courtyard extends outward into open territory. Ground assessment: textured clay bricks separated by weathered sandy mortar. Direct traversal requires precise navigation lanes. Two paces along the brick furrow, I spotted a discarded metal washer caked in dry grit alongside a stiff pine twig. Rigid iron. Circular aperture. I wiped the sand from the metal rim with both hands, laid the washer flat over the mortar intersection, and drove the pointed twig through the center hole into the sand seam. A vertical azimuth marker now stands upright. Ground quadrant zero zero one established.