"Andrew Gideon" wrote in message
online.com...
Dave S wrote:

When Selective Availability was disabled in the Clinton administration,
regional disruption of the GPS signal was the stated
"back-up"/"alternative". This is not new news in the least.

I've read of this before. But I don't see how it could be done regionally
w/o using something like jamming. Do the satellites have the ability to
block their signal to regions?

Individual satellites could be shut down, effectively blanking out large
regions.