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    Re: Silicon Sea Leg 69: ANSWERS
    From: Dan Hogan
    Date: 2001 Apr 10, 01:26 EDT

    On 9 Apr 2001, at 15:59, Yves Arrouye wrote:
    > Dan,
    > For the newcomers here like me, could we get the inner workings of the
    > solution to what may be our first problem? That would really be nice.
    Go to page http://www.angelfire.com/nt/navtrig/index.html, it's an example of
    a Silicon Sea problem.
    > I did questions 1, 2, and 4, and then when the solution came here, I kind
    > of lost interest :) (It would be great to wait more than 5 days to give a
    > solution; maybe a full week?).
    I have no argument. At one time members were asking for a quick response
    on the answers.
    > Below are some of my questions.
    > > 1. FIX= 9d 50.0'N  53d 00.2'W
    > >
    > > 2. TC= 298.1d
    > >    Dist= 424.6 Nmi
    > I tried to apply the mid-latitude sailing formula from 4mulas.txt and got
    > TC = 298 but Dist = 379 Nm. I would appreciate if somebody could see if I
    > made an obvious error, and also explain what method was used (w/
    > reference) to get to the above numbers if mid-latitude sailing wasn't used
    > (maybe it doesn't make sense to use it?).
    Make sure that you calculated Diff in Lat, the DLo and Mid-Latitude(Lm)
    correctly. I get D= 419.1 Nmi and TC= 298.5d using my Mid-Latitude. Also
    most Tables are calculated to 4 places using one-place can tend to
    accumulate error if the calculations are strung together.
    Dan Hogan WA6PBY
    Catalina 27 "GACHA"
    Navigation-L List Owner

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