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    Re: fix with the noon shot...
    From: Tony S
    Date: 1997 Oct 28, 7:20 PM

    PULEEZE ...folks!
            This same proposition (in many cases nicely thought out
    _in theory_) is proferred about every three months on this very list.
            I offer for your learned consideration:
            1. If a true "fix" were possible, it would be heralded in any
            and every navigation text you might have ever read.
            1a. A fix by definition is the most accurate position that
            can be attained by the navigator by (in this case) celestial
            1b. The sloppy navigator can, of course, obtain a _rough_
            _estimate_ of longitudinal position by making many compromises.
            If he has not the slightest idea of his longitude, it is better
            than nothing (Chuck was on the mark here with lifeboat nav).
            2. While theoretically possible, EVERYTHING near LAN depends
            on _absolute_ accuracy of the sextant altitude sight, time and
            related factors.  (delta declination, North/South, East/West
            sailing tracks are _only_ a very _minor_ part of the equation).
            The best method is to bow to well proved practices of
    well time-spaced running fix ...then one can call it an "Rfix".
    (But, still certainly not as good as a true celestial fix).
            Sorry to be so didactic, but the proposition keeps
    coming up as earlier mentioned ...with some folks proferring "a new
            Everything depends on what measure of innacuracy _you_ are
    willing to accept.  SURELY, NO ONE would accept such rough
    approximations in approaching atolls or landfall!
    	A Navigator's well kept DR since last true fix is very
    probably much better.
            Wasted words?  I hope not!  Bye.
            Tony    San Francisco, CA
                    (Home of NAVIG94)
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