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I know that references to GPS are discouraged, if not forbidden, on this
list. But I wonder if a note about GPS shortcomings would be more
acceptable?

I've just received a leaflet from the British Lighthouse authorities,
pushing for use of the new Loran-C transmitter at Rugby, England.

In which is the statement-

"GNSS systems themselves also suffer occasionally from undetected failures;
for example, a satellite clock error on 1 January 2004 gave rise to errors
in measured positions of up to 45 kilometres in Western Europe for a period
of some 3 hours, resulting in onboard navigational failures."

I hadn't heard about that event, which sounds rather serious. Is it common
knowledge? Can anyone offer further details?

It wouldn't have affected me. I would have been by the fireside on that day.

George.

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contact George Huxtable by email at george@huxtable.u-net.com, by phone at
01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy
Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
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