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    Re: Star-star distances for arc error
    From: Frank Reed
    Date: 2009 Jul 3, 20:42 -0700

    Henry H., you wrote:
    "Sorry, I must disagree."
    Yes, on this aspect of the topic, please do. My information comes mostly from 
    small-boat, yachtsmen navigators. There are different "cultures" of 
    navigation, and I have no doubt that there are tricks and techniques 
    developed by professional merchant navigators that did not filter down to the 
    yachting navigators' culture. I have met or corresponded with many navigators 
    who believe they need to dark-adapt so that they can work all through 
    And you wrote:
    "As I have posted before, this method produces the most accurate results as 
    respects position based on the sea horizon."
    I'm not surprised. If my point wasn't clear, I was suggesting that navigators 
    should AVOID this practice of trying for deep dark-adaptation.
    You concluded:
    "As strange as it sounds, I have yet to find this practice clearly spelled out 
    in most standard texts - it's something that is learned at sea."
    There's a lot that's not in the texts. Henry, I do wish you would post more on 
    some of your navigational experiences. Would it help if I say "please"? ;-) 
    These things that you know from your own experience that are not "spelled out 
    in most standard texts" may be greater in number than you imagine. 
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