From: "Steve Ewing" 

On Fri, 28 Jan 2005 13:41:10 -0500, Gary Wiltshire  wrote:

>
> Depends on whether his charts were right or not.  Traveling at high
> speed byinertial navigation without active sonar and with bad maps is
> bad news.

I read they took a sounding just before the grounding, like four minutes
before, and got 6000 fathoms.  If they were already at high speed, that
sounding would be highly questionable: the fathometer is "gated":
you set it for the windo where you expect to get a return.  They could have
gotten an echo/reverberation, rather than a true return.  Or, it was
accurate and they just had Very Bad Luck.

As for inertial navigation, it is very very accurate.  The charts were the
problem, but that's second-guessing of the worst kind.

--
Steve 
http://www.qmss.com/sewing

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