There was a very informative article in Avionics Magazine last year summarising
the current status/vulnerabilities of the GPS constellation. It's well worth a
read.
http://avtoday.com/av/categories/military/35197.html
ian
>
> What is going to happen if GPS has a problem, or if the US puts SA back
> on? Now the only backup for navigation is a sextant.
>
> Steve KD2OM
>
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