The Digital Stacking System has been developed to improve the signal to noise ratio in seismic prospecting by the refraction method. This has been accomplished by stacking the recorded data created by repeated impacts to the seismic source. The benefits of this system have been to eliminate the need for dangerous explosives and to make possible the use of seismic prospecting in areas previonsly closed to its use. This paper will detail the results of actual field use over the past several years and, addition, will discuss the conditions under which the Digital Stacking System can be utilized.