50 nm is about the practical limit so 20km is possible, I believe that in the past there has been some law suit files against USN for conducting trials in the area that have damaged the marine life
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The long delays between pings would indicate a long range search operation or I have heard of sonar uses to disorientate divers who are up to no good
Sent from my iPhone using Tapatalk
The long delays between pings would indicate a long range search operation or I have heard of sonar uses to disorientate divers who are up to no good
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