GPS unreliable NOTAMs

Does anyone know what the "GPS IS UNRELIABLE AND MAY BE UNAVAILABLE" NOTAMs
are all about? Some of them have a radius of nearly 400 nm. That's an area of
half a million square miles--almost three times the area of the State of
Texas. If it's a test of jamming equipment, it sure is conducted on a large
scale ... large enough that it starts to negate the utility of GPS.

--
Transpose mxsmanic and gmail to reach me by e-mail.

Sure we do.. those of us in the SW US know..
Look at "where it is".. and then think.. space based communications
channels.



"Mxsmanic" wrote in message
...
Does anyone know what the "GPS IS UNRELIABLE AND MAY BE UNAVAILABLE"
NOTAMs
are all about? Some of them have a radius of nearly 400 nm. That's an
area of
half a million square miles--almost three times the area of the State of
Texas. If it's a test of jamming equipment, it sure is conducted on a
large
scale ... large enough that it starts to negate the utility of GPS.

--
Transpose mxsmanic and gmail to reach me by e-mail.

Mxsmanic wrote in
:

Does anyone know what the "GPS IS UNRELIABLE AND MAY BE UNAVAILABLE"
NOTAMs are all about?

Yes, I do.

Seen it plenty.

Send me 150$ and I'll tell you all about it.




Bertie