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[PSUBS-MAILIST] Passive vs active sonar

To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Passive vs active sonar
From: peter mckellar <mckellar@earthlink.net>
Date: Thu, 27 Mar 2003 02:51:02 1100 (UTC)

hi all,

could someone please explain the difference between active and passive sonar?

thx in advance
peter

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