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Thank you for the link to the articles in "Innovation." Your
explanation of the Mathematics of GPS was particularly enlightening.

gl

On Dec 17, 4:13�am, "Richard B. Langley"  wrote:
> 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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>
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