The Sonardyne Wideband Sub Mini 6 Plus is a versatile USBL Transponder Responder that supports WBv2 signals. The Wideband Sub Mini 6 Plus is designed for positioning ROVs, towfish and other mobile targets in water depths up to 4000 metres. The Type 8370-1111 WSM 6 Plus is equipped with an Omni Directional transducer and is depth rated to 1000 metres making it suitable for a wide range of general USBL tracking applications. The Type 8370-4112 WSM 6 Plus is a 4000 metre rated unit and features a higher power directional transducer.