[varyouga]

“I believe that's their own system...not ours. So they're just manipulating it.
But I'll go back and read it again. “

GNSS is the combination of ALL the global systems including our GPS. Some receivers can use them all.

The Russians claim they can spoof them all. It is quite easy to accomplish for the civilian networks since the signals have no encryption.

However, US military GPS is on multiple frequencies and encrypted. It has protections for spoofing and the Russians do not claim they hacked that side of the system.

I suppose with powerful enough jammers they could also block military GPS but spoofing is another story.

[Sacajaweau]

They're likely only playing with their own system GLONASS. We do it with ours all the time.

One day we were out, two of us had Garmin 45s...(years ago)....and wham...the system shut down. We had to reboot the whole thing.

[Lonesome in Massachussets]

Even the military GPS signal is relatively weak. Critical military systems have adaptive antennas that can block jammers, and back up inertial navigation systems to get them through temporary GPS outages.

What the Russians are doing is just silly and paranoid. Ignore them.

[frog in a pot]

1. It has protections for spoofing...
Right, and we should assume it is absolutely, "take-it-to-the-bank" bulletproof.

2. ...and the Russians do not claim they hacked that side of the system.
Nor would they.

I think it more likely we are in a day-to-day contest and those of us out here on the sidewalk will never know which of those days we win. One hopes we have not sacrificed any of our sailors at the alter of national security.