For naval vessels, sonar defense systems are the virtual eyes, ears, and nervous system of the ship, receiving and processing data from a variety of underwater sources. Sonar signaling has the vital function of indicating whether vessels in the vicinity are friend or foe according to their sonar signatures. Depending on the nautical environment naval officers rely on sonar sensors dragged behind the ship or sonar buoys floating on the surface to provide important data. The FastCluster 2000 SERIES receives inputs from a number of different data sources and process these input on a single numerical and graphical display.