Stationary targets showing up on passive sonar

nomad_delta · 06-12-07, 03:32 AM

How is it possible that my sonar man gives me contacts like this:

"14:42 SO Sound contact, sir! Merchant Stationary Closing! Bearing 356! Long range!"

If the merchant is stationary, how can it be "closing" (I was moving 0 knots at the time), and more importantly -- how can the sonar man hear it if it's not moving at all? I went to the hydrophones myself and listened in that direction, and sure enough a bunch of 'Unknown' targets appear when I point the hydrophones in that direction -- but no sound, of course!

Is this yet another bug or is there something obvious that I'm missing?

nomad_delta

06-12-07, 03:32 AM	#1
nomad_delta Planesman Join Date: May 2007 Location: San Francisco, California Posts: 185 Downloads: 1 Uploads: 0	Stationary targets showing up on passive sonar How is it possible that my sonar man gives me contacts like this: "14:42 SO Sound contact, sir! Merchant Stationary Closing! Bearing 356! Long range!" If the merchant is stationary, how can it be "closing" (I was moving 0 knots at the time), and more importantly -- how can the sonar man hear it if it's not moving at all? I went to the hydrophones myself and listened in that direction, and sure enough a bunch of 'Unknown' targets appear when I point the hydrophones in that direction -- but no sound, of course! Is this yet another bug or is there something obvious that I'm missing? nomad_delta

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