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    Re: Longitude sight, South Pacific, 1864
    From: Charles McElhill
    Date: 2018 May 16, 17:40 -0700

    Brad

    Thanks for the quick response to my question. I think I do remember the addition and subtraction aspect, but it never hurts to ask just in case there was an additional as an advantage. Thoroughly enjoy seeing these old navigation problem of Frank's. Thanks again!

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