NuvoSonic

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NuvoSonic is a firm who make a diver-detector sonar system tradenamed "SeaScout".

It has swimmer detection, underwater hailing by voice, and non-lethal deterrent.

It uses a sonar system called Parametric Port Security Sonar System = P2S3, which uses a narrow-beam sound technology called Parametric Array Sonic Echo Ranging = PASER (which is a tradename).

It claims to be able to detect divers at distances up to 2 kilometers = 1.24 miles.

NuvoSonic has developed several products:-

To secure a large area around objects surrounded by water.
Sonar barriers to monitor choke points.[1]
Distributed acoustic barrier systems.
Smaller sensors for scanning the underside of tankers, cruise ships, and other surface vessels.
Small sensors that can be carried by a diver or by an Autonomous Underwater Vehicle (AUV), e.g. by a patrol diver looking for submerged unauthorized divers.