"Richard Kaplan" wrote in message ...

With that as background, look at the following NOTAM, which is currently
available on DUAT. We can theorize all we want about whether this NOTAM
exists due to military testing or some atmospheric irregularity or whatever,
but the point is that the NOTAM really is out there and will be effective in
a few days. If my plane had nothing but GPS-based avionics, what would my
options be?

From my discussions with some stationed there, it is airborne GPS jamming testing.