NavList:

Anabasis wrote:

On May 8, 12:26 pm, Lu Abel <lu...@abelhome.net> wrote:
  

I hope, for many reasons, that the EU solves its difficulties with
creating the Galileo system.   But as yet another space-based
positioning system transmitting on the same frequencies as GPS, if
nature (as opposed to a political act) takes GPS down, it will also take
down Galileo.

I think the greater risk is the political act, but you are right
there.  The trouble is that some sort of ionic burst/solar flare from
the sun that would lay to waste the GPS system would probably cause
massive radio blackouts throughout the radio spectrum.  This would
cripple any land based radio navigation as well.

Solar flares will play hob with the ionosphere, hampering long-range radio communications, as well as increasing background noise and therefore reducing the signal-to-noise ratio of signals received from satellites.

Loran runs on 100KHz groundwaves.   Solar activity would not affect this end of the spectrum, which is why the US Federal Radionavigation Plan touted eLoran as an alternative to GPS.

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