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    Re: GPS shortcomings.
    From: Lu Abel
    Date: 2005 Jun 8, 12:50 -0700

    The URL I just sent out was for a paper presented at an Institute for
    Navigation meeting.  I just went to ION's home page and started leafing
    through various conference programs.  I was stunned to see how many
    papers there were at their upcoming Annual Meeting that talked about
    enhanced Loran services as an supplement for GPS.  Two or three years
    ago the US Coast Guard was trying to accelerate their schedule for
    shutting down Loran C.  Now it looks like they and the US Department of
    Transportation (which includes the US's Federal Aviation Administration)
    are concerned about possible problems with GPS in navigation
    applications (such as aircraft routing or precision harbor approaches)
    that require hyper-reliability and appear to be considering an enhanced
    Loran as a backup system.
    Program listing is at http://www.ion.org/meetings/am2005program.cfm#A1
    Lu Abel
    George Huxtable wrote:
    > 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.
    > ================================================================
    > 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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