Abstract: A system and a method for directing a torpedo toward a submerged or surface arget by transmitting steering information to the torpedo via sonic pulses. A suitable underwater surveillance system, such as the Correlation Sonobuoy System, provides an observer with the necessary information regarding the relative bearings of both the torpedo and the target. Using sonic signals generated by one of a variety of suitable sources, the torpedo is steered into the general vicinity of the target while the positions of both torpedo and target are tracked on the underwater surveillance system display. Once directed to the general area of the target by this technique, the torpedo's internal target homing system is activated either automatically or by additional sonic pulses to complete the attack on the target.