Re: [OT] Navy releases photos of U.S.S. San Francisco
From: Pat Flannery (flanner_at_daktel.com)
Date: 01/31/05
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Date: Mon, 31 Jan 2005 04:25:12 -0600
Henry Spencer wrote:
>
>(Such devices really do exist, but whether they are useful and practical
>for submarine navigation is not obvious.)
>
>
Triton found some correlation between hers and their search sonar (their
fathometer was on the fritz) as far as what depth of water they were
traversing... the big problem is that the sea bottom and its topography
can be made out of substances of different density (silt, limestone,
basalt, granite, etc.), and there are local areas of gravity anomaly due
to the underlying geologic structure- and both can throw of the readings
on the device. But if you had one of these near the stern of the sub,
and one near the bow, then you should get a reading of some sort if you
approached a steeply-sloped seamount, such as the sub apparently hit
-based on the damaged area- because of the different degree of
gravitational attraction at the two ends of the sub as the seamount was
approached. The degree of difference and its rate of change at the two
ends of the sub could give you the approximate distance to the seamount
ahead of you.
Pat
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