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    Re: minus index corr better than plus
    From: Barry Hudson
    Date: 2000 Jul 27, 11:22 EDT

    In a way a small I.E can be likened to compass deviation. When adjusting a 2? Dev.
    may be as
    well to leave it because you will end up chasing your tail in an effort to reduce
    it. If you leave
    at 2? you know what you have when applying. Back to sextants, one should always
    test for I.E
    before taking altitude. Easier done on a large ship than a small yacht where the
    horizon is
    bobbing up and down. Checking for IE is especially important if more than one
    person is
    using the same sextant as the other people may have missused and this should always
    be
    assumed.
    Barrie Hudson
    Aubrey O'Callaghan wrote:
    > Dan,
    > Why do you talk about getting it serviced ?
    > This is an adjustment that the Navigator can make to the sextant. The text
    > books say that one should not worry about a few minutes, to try and correct
    > this. Correcting out small off/on the arc erros are called "worrying the
    > sextant" and eventually end up with the adjusting screws becoming "loose".
    > In any case we calulate out the small differences.
    >
    > Aubrey.
    > ==============
    > t 07:04 PM 26-07-00 -0700, you wrote:
    > >On 25 Jul 2000, at 15:18, Russell Sher wrote:
    > >
    > >[Snip OFF/ON Stuff]
    > > >
    > > > If the error is on the arc Subtract it, if the error is off the arc ADD it.
    > > >
    > >
    > >I just looked at my FREIBERGER Sextant. It has 5 degree marks below the
    > >zero. If it was off more than that, I would not use it, but get it
    > >serviced. What type of Sextant, with out marking below Zero are we talking
    > >about???
    > >
    > >Dan Hogan
    > >dhhogan{at}XXX.XXX
    > >NAV-L Web Page: http://nav.cnchost.com
    >
    > =================================================================
    > Aubrey O'Callaghan
    > Wandrin' Star of Dart
    > Rival 38
    >
    > Contact: Venezuela,
    > Puerto La Cruz
    > 00-58-14 210 4625 (Cellular)
    > 00-58-81 818 667
    

       
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