The ornamental design for an electronictrackingdevice, as shown and described.
FIG. 1 is a top, front, right side perspective view of an electronic tracking device according to my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
Any line shadings in the figures are included for the purpose of illustrating contour and are not intended to be illustrative of texture or gloss. None of the broken lines form a part of the claimed design.