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    Re: Leg 67 - I give up!
    From: Dan Hogan
    Date: 2000 Jul 20, 09:30 EDT

    Paul:
    Sorry my GOOF! See below and revised Leg 67 posted same time as this
    message.
    On 20 Jul 2000, at 2:47, Paul Hirose wrote:
    > After wasting far too much time today on Leg 67, I'm giving up. Have
    > not been able to solve the celestial fix. The problem is that only the zone
    > time of the shots is given. Not having worked any of the recent Silicon Sea
    > legs, I don't have the dead reckoning longitude necessary to convert zone
    > time to UT.
    Apply the Zone Description(ZD) to the ZT for UTC time.
            ZD= DR Lon / 15
    > >From the wording of the problem, I inferred that sailing 614 mi on
    > course 290 would take us toward Barbados, but we wouldn't be there
    > yet. So, with a small scale chart, I backed up 700 mi from Barbados on the
    > reciprocal course, and took that as the assumed position for my sight
    > reduction. My LOPs showed the guess was far off, but they did cluster well
    > enough for me get an improved assumed position. With that and a
    > larger-scale chart I re-reduced the sights. Unfortunately, the first two
    > sights I reduced still had big intercepts. At that point I called it quits.
    > No doubt some blunders on my part have not helped; I haven't done celestial
    > in a long time.
    Paul:
    My apploogies. I left out the EP position. EP= (02d 22.8'N  29d 24.9'W)
    [Snip correct assumption and tedious practice]
    Dan Hogan
    dhhogan{at}XXX.XXX
    

       
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