A walk-over tracking system is used to help guide and monitor the location of the bore. The system is comprised of a transmitter and receiver. The transmitter or sonde is located in a housing unit near the front of the drill string. The transmitter emits a continuous magnetic signal, which is picked up by a portable hand-held receiver. Data transmitted to the receiver allows the tracking hand to determine position and depth as well as clock-face position of the drill bit. This information allows the operator to track location along the planned bore and to make changes as needed.
Description published by the International Society for Trenchless Technology within its parent technique's article.