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    Re: learning sight reduction
    From: Lu Abel
    Date: 2006 May 4, 10:44 -0500

    Carl Herzog wrote:
    > .. I convert back and forth between second and tenths of a minute in my head.

    As one who grew up in the age of slide rules rather than calculators, I
    have found at least one use for an old 6" plastic slide rule.

    One thing I find more than a bit annoying about US charts is that while
    all coastal and larger-area charts have edge-scales for lat and long in
    degrees and minutes, many harbor charts use degrees, minutes, and
    seconds.  Since my GPS wants data entered in a consistent format (which
    I have set to degrees and minutes), when I encounter such a harbor
    chart, I have to convert seconds to decimal fractions of a minute.

    Out from my nav table comes this old slide rule!  Put the "1" over the
    "6" (preferably on the A/B scales rather than the C/D scales) and I've
    got a very effective seconds to fractional minutes converter!

    Lu Abel

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