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    Re: Silicon Sea: Leg 82 Q4
    From: Dan Hogan
    Date: 2001 Dec 10, 8:21 AM

    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---.net (Paul Hirose)
    Dan Hogan WA6PBY
    C27 "Gacha"
    Nav-L Page: http://www.wa6pby.com

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