The Sonardyne Oceanographic Release Transponder (ORT), Type 7409, is a highly reliable, sturdy, economical Acoustic Release. The release will operate, following a secure sequence of commands provided by the Sonardyne Lightweight Command Unit (LCU), Type 7663. It is also possible to range from the LCU to the ORT without activating the release.
The secure sequence of commands will stop random interrogation by ambient noise and so extend battery life. The housing endcaps and guard are constructed out of aluminum bronze to give the 7409 strength and resistance to corrosion. The release mechanism is constructed out of a stainless steel casting. The battery status, angle of tilt and state of release can all be monitored via an acoustic telemetry link by the surface LCU unit.
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