Abstract: In training simulators of older sonars, made in analog technology, noise, reverberation and echo signals were generated and processed by complicated, analog circuits informs close to real signals. In simulators of new sonar's generation, with computer processing and displaying, the generation of dynamic sonar images, included full signal processing realized by real sonar, is possible directly by personal computer. In this paper some methods of echo signals, reverberations, and noise computer generation for made training simulator of ahead and side looking sonars are presented as well, as changes of sonar's settings simulation and some regards about construction of simulators and simple communication with computer "teacher's" station. Two examples of real and simulated displays (for ahead and side looking sonars) are shown.