| From: | Joshua Ring strago@***.com |
|---|---|
| Subject: | magical effects for sea-going runners.... |
| Date: | Tue, 16 Mar 1999 22:29:20 -0500 |
doesn't emanate from INSIDE the drone, but it's outer surface, correct? I think
active sonar would detect anything with enough consistency to either absorb or
reflect sound waves.
Starrngr@***.com wrote:
> In a message dated 3/16/99 10:15:54 AM Pacific Standard Time, GMPax@***.com
> writes:
>
> > Against passive, ALl that would be gained is a bearing, and it'd bee seen,
> at
> > first at least, as an _equipment_ failure or error.
> >
> > As for passive, same deal, but then they KNOW for no uncertain fact, there
> > IS
> > something in that direction. :-)
>
> Having been a sonar operator in the Navy, I can state with total certaintly
> that you CAN find something with passive sonar using just a bearing, even if
> its a bearing of complete silence (which would be so noticeable that it would
> be unusual. Like I said, the oceans are NOISY, with a capital NOISE) The
> Process is called Target Motion Analysis, and while slow, is what submariners
> and surface ships use to localize and attack a target without ever using
> active sonar, which would give away ones own position... Active sonar pulses
> can be heard at many multiples of the range where you can get a usable return.
>
> Indeed, this seems to scream for some sort of improved silence spell which
> damps all sound originating inside of it but allows outside sounds through.
> THAT would be an effective shield against sonar detection.
