FIG. 1 is a top-left perspective view of a tracking device; FIG. 2 is a top-right perspective view of the tracking device; FIG. 3 is a back view of the tracking device; FIG. 4 is a front view of the tracking device; FIG. 5 is a left side view of the tracking device; FIG. 6 is a right side view of the tracking device; FIG. 7 is a top view of the tracking device; and, FIG. 8 is a bottom view of the tracking device.