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    Re: USCG approves use of electronic charts
    From: Paul Hirose
    Date: 2016 Feb 11, 16:53 -0800

    Around the turn of the millennium, when the US Navy made a big push to
    adopt ECDIS, an interview with the Deputy Navigator of the Navy was
    published in a Navy IT magazine. I found one thing she said rather
    surprising:
    
    "In November 1995, the IMO issued a resolution entitled Electronic
    Charting Display and Information System (ECDIS) that set the
    requirements that commercial vessels had to meet to safely replace paper
    charts with digital charts displayed on interactive computer systems...
    When we reviewed the civil specifications, we determined that we could
    use it with only minor modifications that included... the ability to
    plot lines of positioning and to navigate the ship using dead reckoning..."
    
    Huh? The civil ECDIS standard didn't provide for DR and plotting of LOPs?
    
    http://www.doncio.navy.mil/CHIPS/ArticleDetails.aspx?ID=3167
    
    
    In contradiction, a comparison chart in this Naval Postgraduate School
    thesis, "Electronic Chart Display and Information System-Navy: analysis
    and recommendations," says all the systems accept celestial inputs and
    can do running fixes and dead reckoning.
    
    The author estimates a typical Navy ship needs about 500 paper charts
    per year just for updates. Outfitting a new ship requires several
    thousand charts, he says.
    
    http://calhoun.nps.edu/handle/10945/10894
    
    Anyone have details on how celestial inputs are fed into an ECDIS? I
    suppose a minimum implementation would let you input as assumed
    position, bearing of the body, and the intercept (distance toward or
    away). It would then draw a LOP. An elaborate implementation might
    include an almanac and automatic sight reduction.
    
    
    In 2001 the Navy issued a message about their plans to put ECDIS on a
    fast track. Paragraph 10 is interesting:
    
    10.  NAVTIP: A PC/WINDOWS-BASED SOFTWARE SYSTEM TO ESTIMATE LATITUDE
    AND LONGITUDE ASTRONOMICALLY (STELLA 2.0) PROVIDES A STANDARD,
    AUTOMATED MEANS OF PERFORMING CELESTIAL NAVIGATION COMPUTATIONS.
    ORDERING INFORMATION IS AVAILABLE FROM THE NAVIGATOR OF THE NAVY
    WEBSITE.  REF E REQUIRES MAINTAINING SHIPBOARD PROFICIENCY IN
    CELESTIAL NAVIGATION.
    
    However, there's no Reference E in the message. The list of references
    only goes up to D.
    
    http://www.public.navy.mil/bupers-npc/reference/messages/Documents/NAVADMINS/NAV2001/nav01178.txt
    

       
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