Modification of Navy Sonar Systems results in Improved Performance in the Reverberation Dominant Littorals; including-- 1) Surface Ship Sonars; 2) Submarine Sonars 3) Airborne Dipping Sonars; 4) Torpedo Sonars; 5) Unmanned Undersea Vehicle Sonars; 6) Diver Sonar; etc; PRIMAMETRIC Sonars include-- Primary Frequencies; Parametric-Difference Frequencies; and Parametric-Sum Frequencies