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that is a VERY interesting article - if I can connect the dot presented by vitaman - when POTUS when to Singapore, it's believed there was a missile threat from Whidby Island. This week, when POTUS went to Vietnam, there's a GPS military jamming exercise. It could well this indicates be there were defensive countermeasures this time around. That's quite the coincidence!

In late February and early March, FAA flight advisories notified pilots of “GPS interference testing” events scheduled to take place in Fort Lewis, Washington; Fort Polk, Louisiana; White Sands Missile Range, New Mexico; and Fort Bragg, North Carolina. Each of the multi-day events “may result in unreliable or unavailable GPS” signals, the flight advisories said. The GPS interference event in Washington state between Feb. 26 and March 1 highlights the far-reaching impact of GPS jamming. Encompassing a complex airspace area in a densely populated region, the exercise stood to affect 67 airports where about 1,500 aircraft are based, as well as many arrivals at Seattle-Tacoma International Airport.