The STI-350 Surface Acoustic Receiver is the next generation in underwater acoustic receivers. Self-contained, the STI-350 uses a staff mounted directional hydrophone to track and relocate underwater sound sources. Designed for the rigorous marine environment, the STI-350 allows an operator to locate underwater pingers that operate between 25-45Khz. In addition, the STI-350 can be used with a custom line of underwater transponders that provide an operator range and bearing to a marked subsea target. Battery operated, the STI-350 uses a LCD to display range/signal strength and bearing to the target beacon. Sealed switches allow the operator to access the many functions of the STI-350. A rugged aluminum anodized staff assembly allows easy deployment of the highly directional hydrophone. The STI-350 sets a new standard in subsea acoustic receivers.