[time-nuts] GPS outage?

[Magnus Danielson]

On 09/05/2013 03:37 AM, Bob Camp wrote:
> Hi
>
> My guess is that if GPS was down over the northeastern part of the US for most of a day, you would not have to check with TimeNuts. It would be on the evening news. Since your typical mobile GPS needs more sats than a timing receiver, they should drop out first. When the entire car / truck / bus / ambulance driving population of a couple dozen states all gets lost at once - you'll hear about it…..
Each bird "illuminate" about one third of the earth surface, so if about
one third of the constellation would be off line it would have been a
major event and seen over more than half the earth as a drop too. I see
no strange notes in the GPS OPS Advisory, just the normal maintenance
with nominally 32 birds on air.

There are ways by which GPS reception is disrupted, for instance by
other transmitters. A few other causes like solare flares is said to
cause it, and I think I've heard about issues around vulcanos.

Cheers,
Magnus