RE: [PSUBS-MAILIST] Passive vs active sonar

["Rob" <rbell@fidnet.com>]

Wow, I can finally add value.  Passive sonar (simply put) is listing to
the sounds around you without doing any noise making of your own.
Active sonar is generating a sound then listening to the echo from
objects near you.  Active sonar is what you get in the movies.  That
"ping" noise.  The active sonar I was used to (x-navy here) does not
usually sound like the classic "ping".

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of peter
mckellar
Sent: Thursday, March 27, 2003 2:51 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Passive vs active sonar

hi all,

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

thx in advance
peter