ERAPSCO operates as a joint venture between Sparton, an Elbit Systems of America Company and Undersea Sensor Systems, Inc. d/b/a Ultra Maritime for design, development and manufacturing of U.S. Navy sonobuoys and transducers. ERAPSCO has been developing products for the U.S. Navy since 1987.

Sonobuoy TechSystems (STS) operates under ERAPSCO for all ITAR approved International sales and technical support of U.S. specification sonobuoys.

ERAPSCO leverages their sonobuoy expertise into the development of advanced sonar systems for a growing number of U.S. DoD and affiliated customers.