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    Re: Round-off
    From: Jeremy C
    Date: 2009 May 17, 17:08 -0700

    I've never heard of rounding to the nearest whole minute during
    reduction.  That doesn't seem too wise to me.  What I was taught from
    all sources is to carry 1 decimal point at all times (0.1' of arc and
    0.1 deg in azimuth).  This was for all tabular reduction.  When I work
    with formulae, I am carrying 13 places in my calculator and then round
    to the nearest 10th when I am finished.
    Using my tools on paper charts/plotting sheets for Celnav, I am
    usually interpolating by eye, divisions less than 1 minute of lat or
    long and within 1 degree of azimuth.  Better precision in the
    reduction process is generally wasted during the plotting process in
    If you are using computers to plot, its a whole other story in both
    reduction and plotting precision.
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