Speculation? No not at all as basically there are several areas with semi regular active NANU's and GPS Service Interruptions
Kerry, that's a great search & find. I had looked around the Coast Guard website and found nothing.
Ultimately, as we all know, the GPS first priority is for US government use and the ability to restrict the use by others is essential. But now I'm curious to see, based on those exact schedules you found, what effect it will actually have on measurements.
We'll see what effects First Coast geocachers experience...