Close the gap in your situational awareness by specifying the world’s most widely deployed underwater intruder detection sonar, Sentinel, to help safeguard your maritime assets.

Whether it’s protecting a commercial harbour, naval vessel, private yacht, critical national infrastructure (CNI) facility or waterside residence from the threat of attack, Sentinel is cost-effective, easy to operate and proven in all theatres of operation. 


Sentinel detects, tracks and classifies divers and autonomous underwater vehicles (AUVs) approaching a protected asset from any direction and alerts security personnel to the threat. With the ability to identify targets at ranges of up to 1,500 metres*, Sentinel takes reliable, long range underwater intruder detection to a new level and since its introduction, has been used in CNI, vessel and VIP protection duties around the world.

Sentinel is small and lightweight so is quick to deploy from a boat, install in a port or fix along a coastline – providing you with an instant underwater security shield. We’ve engineered all the complexity associated with configuring and operating advanced sonar technology into easy-to-use software meaning that your security personnel don’t need to be sonar experts to use it. In fact, once it’s set up, Sentinel can be left to run autonomously.


The base system, Sentinel, is configured to meet the needs of commercial and infrastructure facility protection projects. It can be used as a standalone security sensor or integrated with third party command and control (C2) security systems. Support for networked sonar is also offered, meaning that entire waterfronts can be protected using a single operator station.

Our Sentinel Expeditionary System is a portable diver detection sonar (PDDS). Its small topside footprint means it’s perfect for short term operations using offshore patrol vessels (OPVs) and temporary sites on shore. We also offer a military-only variant not available to private or commercial users.


*Depending on environmental conditions and product variant. 900 metres range for divers