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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@unb.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/
===============================================================================


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