Interesting Reports..
http://charly015.blogspot.com.es/2018/03/el-gps-falla-en-el-mediterraneo-oriental.html
On spanish ,but what it says is...
that GPS signal around Syria is
experiencing major issues.. since 2 months ago ,and that since 21 of march it have been more dramatic..
and that everyone is pointing fingers at Russia..
also that during ZAPAD 2017 exercises in belarus ,of Russia military ,the same happened...
So it looks true the rumors that Russia can jam US GPS system..
So Sad that NATO don't have such capabilities..
Update..
https://www.defensenews.com/air/2015/05/31/guided-bomb-makers-anticipate-gps-jammers/
There says Pentagon have been aware of GPS jammers since 2011 at least..
That North Korea have them.. but also IRAN.. that they used to confuse the American supposed to be
"stealth drone"... And the solutions to counter GPS jammers are as follows..
1) Design Missiles that target GPS jammers..
-problem.. useless in zones with heavy air defenses like Syria and decoys to fool those
anti GPS jammers....
2)Laser guidance.. assistance on the cruise missiles..
-Problem ,you need to be close to the target ~10km and with line of sight..
and is useless in bad weather and if the special forces can't get close enough to the target..
Reason why Syria needs to clear territory as much as possible in Syria ,to push farther any
potential laser guided attacks on Syria military base.
3)TV camera assisted guidance...
-Problem.. lasers can blind /damage the optics in the cameras..
and if the missile is guided by radio, EW can jam the guidance too..
If the missile have automatic AI guidance ,not operated by control remote..
Russia can shot down the missile with its short air defenses.. or attack the missile
with direct energy attacks.. overwhelming the electronics..
So basically they even admit ,that there is no magic replacement for GPS guidance..
means NATO is really doomed.. if a fight with Russia. if they deploy all their EW toys..
Ballistic missiles or long range rocket artillery can be the better option ,but Russia have them too.