The ornamental design for a trackingdevice, as shown and described.
FIG. 1 is a front perspective view of another embodiment of the tracking device showing our design;
FIG. 2 is front view thereof;
FIG. 3 is a side view;
FIG. 4 is a side view thereof, opposite that shown in FIG. 12;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is an environmental view thereof;
FIG. 8 is a cross-sectional view thereof; and,
FIG. 9 is a front perspective view of the tracking device shown in FIG. 10 showing a removable cover exposing a cavity of the tracking device showing our design.
The broken lines in the drawings illustrate portions of the tracking device that form no part of the claimed design.