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    Re: Navigation: celestial and otherwise
    From: Frank Reed
    Date: 2014 Jun 25, 14:39 -0700

    Hello Bob, 

    Just a quick reply here, more later. You wrote:
    "At least I'm assuming "ac" means dead reckoning.  I'm being thick--you have any idea what "ac" is an abbreviation for?"

    Yes, that's longitude "by account," and you're right -- it's the same as DR.

    -FER

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