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From: mr10+@andrew.cmu.edu (Michael Reed)
Newsgroups: sci.military
Subject: What is "passive sonar?"
Message-ID: <27070@amdcad.AMD.COM>
Date: 1 Sep 89 08:01:23 GMT
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From: Michael Reed <mr10+@andrew.cmu.edu>
Speaking of Thomas Clancy [a few weeks back], I was
 rereading  _The Hunt for Red October_ last night and
 found myself wondering what passive sonar is.  I know
 the basics of active sonar, and can fully understand the
 perils involved.  But what is "passive?" I assume that particulars
 are highly classified, but would appreciate any non-classified
 info.

Thanks in advance, 

--
Lestrade
<mr10+@andrew.cmu.edu>
"Do not come to this University."