Transponder and Interrogator compatible with Sonardyne systems
Commercial diving companies operating in an area that requires their diving bell to meet offshore standard DNV-OS-E402, must have an emergency locating system that meets section 305 of that standard.
RJE International provides the ATT-400/AODC transponder – a small battery operated underwater acoustic device, which is used to mark commercial diving bells for emergency relocation to depths of 1000 meters. The interrogation frequency is factory set to 38.5kHz (Ch-A) or 39.5kHz (Ch-B) and, when interrogated, replies to the pre-set emergency frequency of 37.5kHz and meets the DVN-OS-E402 standard.
A diver held interrogator for the transponder, the DTI-300/AODC interrogator is also available. To ensure a smooth transition, the ATT-400/AODC transponder is compatible with the older Sonardyne systems and can be located with the Ranger2 USLB system and Homer-pro receivers presently in use and fielded.
![]() |
| AODC Transponder and Interrogator for Diving Bells. |
Up to 25-hour mission duration
Speeds up to 4.2 knots
Increased module payload capacity
Search and recovery
Hydrography
Deep sea mineral exploration
Marine & Fisheries research
Our super-bright LED provides unparalleled visibility in even the worst conditions and our solid state surface sensor's reliability is a significant improvement over mechanical methods.
Read moreThe Kailani Telemetry Buoy (KTB) implements seafloor to space communications for ocean floor instruments.
Read moreDiver/Asset Recovery System (DARS)
The Diver/Asset Recovery System (DARS) allows Public Safety Divers (PSD) to easily relocate subsea assets and other divers during search and recovery missions in the poorest conditions. The DARS system...
Read moreFrom Delivery to Deployment: Building Australia’s Autonomous MCM Capability
Following the successful delivery of the first REMUS 300 systems earlier this year, BlueZone Group is continuing to build Australia’s autonomous Mine Countermeasure capability, bringing together advanced platforms, sensors, software...
Read MoreMaking Waves in the Littoral Zone: BlueZone Group at Land Forces 2026
While much of Land Forces 2026 focused on drones, land systems and emerging battlefield technologies, BlueZone Group brought something different to the exhibition floor: a comprehensive showcase of capability designed...
Read MoreHigh-Resolution Seabed Intelligence with Kraken Robotics KATFISH
See More. Survey Faster. Operate Safer. Across defence, offshore energy and marine research, the ability to survey large areas of seabed while retaining the resolution required to identify small...
Read More