Abstract: Various embodiments include a system comprising a remote unit operable to determine a geographic location of the remote unit, and to transmit data indicating the location of the remote unit, the remote unit coupled to a subject to be tracked, the remote unit operable to provide a stimulation to the subject, and a base unit operable receive the data indication the location of the remote unit, to determine if the remote unit is within a defined perimeter, and to signal the remote unit to provide the stimulation to the subject if the remote unit is not within the defined perimeter.