ERAPSCO is a joint venture between Sparton Corp and Ultra Electronics for the design, development, and manufacture of the US Navy’s sonobuoys and transducers. The company’s specialized sonobuoys detect electric fields and magnetic anomalies, and measure environmental parameters such as water temperature versus depth, air temperature, and barometric pressure. ERAPSCO offers products that can monitor and detect magnetic anomalies, water temperature, underwater object movement, electric fields, air temperature, depth, and barometric pressure.