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    Re: USN going paperless and celnavless
    From: Richard B. Langley
    Date: 2009 Dec 17, 08:13 -0400

    4th item down talks about the early days of electronic charts:
    
    -- Richard Langley
    
    Quoting Bruce Hamilton :
    
    > I would be very interested in the computer setup required to give a safe and
    > reliable electronic chart and navigation system. I don't use the words
    > computers and reliable in the same sentence especially when a network is
    > involved
    >
    > I imagine several independent stand alone computers each with their own
    > uninterpretable power supply. They could be networked to a server for
    > updates and information sharing, but have the files synced for when the
    > network goes down, as it will. Multiple servers in a failover system can be
    > quite relaible, but to get a system to be reliable enough for a warship must
    > be quite a system.
    >
    > I was on the bridge of a Canadian Coast Guard Vessel when they were first
    > getting into electronic charts and they basically had 2 stand alone
    > computers linked to the GPS and Radar, but all work was still done on paper
    > charts.
    >
    > For pleasure boaters doing offshore work I understand that 3 GPS with
    > plotters is sort of a standard redundancy, but I would guess that paper
    > charts are still carried, as well as a spare compass, spare watch and
    > sextant. Redundant electricity is another problem as well.
    >
    > For emergency navigation purposes, you don't need many charts. I imagine
    > that chart from The Raft Book would even do in a pinch.
    >
    > --
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    ===============================================================================
     Richard B. Langley                            E-mail: lang---.ca
     Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
     Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
     University of New Brunswick                   Fax:      +1 506 453-4943
     Fredericton, N.B., Canada  E3B 5A3
         Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
    ===============================================================================
    
    
    --
    NavList message boards: www.fer3.com/arc
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