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    Re: Exercise #11 AM star fix
    From: Jeremy C
    Date: 2008 Jun 6, 16:44 EDT
    I have plenty of star fixes in the old navigational notebook.  The next few, following these comments, will have somewhat vague DR positions and I will only give the GPS fix at solution time.  This will give it a more traditional flavor.
     
    I will try to get a few more next week when I go out to sea if the weather cooperates.  That will be it until October however, since I am leaving the ship in less then 2 weeks.
     
    Jeremy
     
    In a message dated 6/7/2008 6:18:42 A.M. West Pacific Standard Time, george@huxtable.u-net.com writes:

    GregR wrote-

    And..... not to nit-pick what seems to be our preferred methodology for
    solving these, but if we're all just going to use our favorite
    navigation computer programs (and I realize that computers are the norm
    for doing navigation these days, even I do that), what are we really
    exercising other than our data entry skills (and maybe a chance to see
    how the various celnav programs compare with each other)?

    I'd like to request that at least a few of these be solved by the "old
    school" method (i.e. only an almanac, sight reduction tables, plotting
    sheets (and the usual navigation drawing tools), but no
    computers/calculators other than maybe to check our work). I think
    that's more a measure of celnav skills than just plugging a bunch of
    numbers into a computer program and hitting "Calculate".

    ================

    And I agree with him. It would be interesting to see a mix of results,
    obtained by various methods.

    And I would suggest another way to add interest and test us a bit harder.
    Jeremy bases his problems on a real-life situation (and I REALLY appreciate
    that!) but that means that he can start off with a precise GPS position and
    then we check whether the celestial observations agree with it. But what
    about dithering that GPS position, giving it only to the nearest degree or
    two, or more (and saying so), like a very bad case of "selective
    availability"? Then, it would become a more real test, in first having to
    choose an appropriate AP (assumed position), just as one might have to do at
    sea, from a DR position, if "all else failed".

    George.

    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.

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