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Subject: Re: Silicon Sea: Leg 82 Q4
From: Dan Hogan (dhhogan@XXX.XXX)
Date: Mon Dec 10 2001 - 10:21:21 EST
On 8 Dec 2001, at 13:20, Paul Hirose wrote:
[Snip Comment]
>
> > The sky has been overcast for days. we have been unable to get a sight. Var
> > 10.0dE Dev 1.0dE. Speed 10.4 Kts.
> ...
> > 4) What is the Speed Made Good(SMG) to this DR?
> > What is the Compass Course(CCMG) this DR?
>
>
> I don't understand why the correct answer is 10.8 kt, not 11.1. The
> speed used for the DR (which does not include current) is 10.4. The
> current is .7 kt flowing toward 285. That's just 6 deg off our course,
> so for practical purposes it should add directly to our speed thru
> water, shouldn't it?
>
> Also, why isn't the correct answer for CCMG identical to the compass
> course we're been steering?
Hmmm. I think I left out some information. See revised Leg 82 comming out.
> The part I clipped out is the sun line at 2010Z, but it should have
> nothing to do with the DR. It's crossed with another sun line for a
> running fix later.
>
> --
>
>
> paulhirose@XXX.XXX (Paul Hirose)
Dan Hogan WA6PBY
C27 "Gacha"
dhhogan@XXX.XXX
Nav-L Page: http://www.wa6pby.com
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