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    Re: Historical charts and mapping
    From: Brad Morris
    Date: 2016 Aug 21, 21:40 -0400

    Correction to my earlier post. I stated that 1 second of arc was 2 feet of displacement. That is wrong.

    1 minute of arc is a nautical mile
    A nautical mile is ~ 6076 feet
    6076/60 ~ 101.27 feet.

       
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