Re: Experts: GPS system 'close to breakdown'

[Valdis.Kletnieks () vt edu]

On Thu, 28 May 2009 08:26:08 PDT, Benjamin April said:
> > "US government officials are concerned that the quality of the Global Positioning System (GPS) could begin to 
> > deteriorate as early as next year,
> > resulting in regular blackouts and failures – or even dishing out inaccurate directions to millions of people 
> > worldwide.

> I call FUD. A sensible GPS should cease to give directions if the
> current EPE (Estimated Position Error) exceeds a reasonable value.
> Based on the position of the satellites detected and their relation
> to the receiver it can calculate an approximate accuracy.

> Lack of satellites could cause outages, it won't direct you to
> Seattle when you are headed for Boston.

Your GPS thinks you're heading north into Blacksburg from I-81 on the 460
Bypass highway.  You need to take an off ramp on the right hand side, then bear
right to get onto Transportation Research Drive, then a left onto Industrial
Park Road to eventually get to my office.

Unfortunately, if you were actually heading north on *Business* 460 a few
hundred yards west, taking the right-handed off ramp at the same relative
location, then bearing right, will land you on a ramp pointing you *back* south
to I-81, and you won't have a chance to turn around for about 2 miles.

http://maps.google.com/?ie=UTF8&ll=37.191194,-80.402327&spn=0.013829,0.022767&z=16

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