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    Re: minus index corr better than plus
    From: Dan Hogan
    Date: 2000 Jul 25, 09:20 EDT

    On 25 Jul 2000, at 9:29, Russell Sher wrote:
    > How's this reasoning:
    >
    > An 'on the arc' (negative) correction is easier to read since it is read
    > straight off the micrometer drum. An 'off the arc' error would be
    > calculated by reading the drum and taking the 60' complement - for example:
    > An error of 2' on the arc will be read as 2' when the instrument is being
    > checked and the error has been noted. An error of 2' off the arc will be
    > 58' ( equivalent to -2'). correct??
    Since the Sextant error will be what ever the Sextant has, I use an old
    adage I was taught.
    "On the arc OFF, off the arc ON"
    If the error is on the arc Subtract it, if the error is off the arc ADD it.
    Dan Hogan
    dhhogan{at}XXX.XXX
    NAV-L Web Page: http://nav.cnchost.com
    

       
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