Abstract: A low power asset tracking system includes a mobile unit and a base unit, at least one mobile unit being in communication with the base unit. The mobile unit includes a broadcast circuit having a motion sensor for determining motion of the mobile unit in at least one direction and a transceiver for receiving the motion information signal as a function of an output of the motion sensor. A power source powers the mobile unit. An energizing circuit is disposed between the power source and the transceiver for selectively powering the transceiver. The energizing circuit is under the control of the motion sensor to power the transceiver in response to an output of an energizing signal of the motion sensor. The motion sensor outputs the energizing signal upon detection of a motion in at least one direction of the mobile unit in excess of a threshold amount. The system also includes a base station for receiving the motion information and determining a position of the asset as a function of the motion information.