Scott Skylane wrote:
Travis Marlatte wrote:
I can't imagine that this hasn't been discussed but I didn't find
anything in my search. I've been ignoring it since it specifically
says "NON CIVILIAN GPS." But, this just seems so weird.

!GPS 04/036 ZAU NON CIVILIAN GPS MAY BE UNREL OR UNAVBL WITHIN A
240 NM RADIUS OF 420153N/913847W AT FL400 WEF 0704250001-0712312359

That's April 25 through the end of the year, right? Non Civillian.
FL400? No higher. No lower. No block altitude. The lat/long is
somewhere around Cedar Rapids, IA, right?

That's that all about?
I'd guess that Collins is doing some high-tech testing/development work.

Sounds likely to me. Since it's become
politically and practically impossible
to turn the entire GPS system off to
neutralize a hostile threat, the government
is working on equipment and techniques to
deny GPS coverage over specific areas.

Probably a test of that equipment.