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    Re: Position lines, crossing
    From: Lu Abel
    Date: 2006 Dec 10, 21:56 -0800

    With deepest respect, Henry, a previous poster pointed out that most
    texts suggest that LOPs taken at sea are at best good to +/- 2 NM and
    that for small craft +/- 5 NM is more likely.   I agree.   So I'm
    wondering under what conditions your sights were taken and/or what scale
    you used in plotting them!
    I don't mean in any way to demean your skill, I just am reflecting the
    track of this discussion, which is that any navigator worth his salt
    will not only be able to plot a LOP on a chart, but also fully
    understand the uncertainties associated with it.
    Lu Abel
    halboth wrote:
    > Hi Peter,
    > I most certainly am Peter, and have hundreds, if not thousands, of
    > positions in my navigation workbooks to demonstrate this fact.
    > Regards,
    > Henry
    >     ----- Original Message -----
    >     *From:* Peter Fogg 
    >     *To:* NavList@fer3.com 
    >     *Sent:* Sunday, December 10, 2006 11:55 PM
    >     *Subject:* [NavList 1877] Re: Position lines, crossing
    >     Henry wrote:
    >         In my opinion, "cocked hats" are most often the result of
    >         altitude errors induced by varying horizon conditions due, in
    >         the case of stars, to failing light conditions.
    >     Henry, are you saying that given ideal conditions (as you have
    >     described) LOPs can in practice meet, or almost meet, at a common point?
    >     >
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