Abstract: The Sonar Performance Prediction System (SPPS) will be introduced. The SPPS is an integrated ocean-acoustic propagation model coupled with a sonar performance prediction model. A stationary sea surveillance sonar consisting of a horizontally nested hydrophone array and a vertical transmitting/ receiving array may be used to detect, localisc and track surface and subsurface contacts within its coverage area. The performance of the sea surveillance sonar has been investigated with the SPPS. Results of that performance prediction will be presented.