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CLF Officer
Location: RCL pier: 12 min
Join Date: May 2005
Posts: 56,627
Frubals:2147483647
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Today: 
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There is a rather sophisticated defensive system that uses high frequency sound, with which SOME cruise ships are equipped. I believe it may be called a "LARS."
Perhaps someone who is up to snuff on this device can chime in with further information.
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