GPS blackout coming

https:// www.zerohedge.com/news/2018-01-26/usaf-begins-massive-gps-blackouts-western-us-during-largest-ever-air-war-drill

"Flying.com reports the drills at the Nevada Test and Training Range will cause rolling GPS blackouts for the vast portions of the Western United States from January 26 through February 18. All GPS-equipped aircraft operating in the Western United States should be prepared for possible navigation failure in the region."