A tracking device for a surgical navigational system. A tracking head includes tracking elements configured to communicate tracking information to the surgical navigation system. An extension arm is configured to be coupled to the tracking head, and a bone plate is configured to be coupled to the extension arm. The bone plate is further configured to be coupled to anatomic structure and includes openings each configured to receive a fastener. A central opening may be provided to receive an additional fastener for coupling the extension arm to the bone plate. A recess within the top surface may receive the base plate of the extension arm. Spikes of the bone plate are configured to penetrate the anatomic structure and, in conjunction with the fasteners, prevent movement of the tracking device. The bottom surface is concave between the spikes to define a space configured to accommodate portions of the anatomic structure.