Something big happened to GPS service in the Denver area on Jan. 21.
 
 On that day, Air Traffic Control issued a notice advising pilots of problems

What happened to GPS in Denver?

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2022-09-21 20:00:31

Something big happened to GPS service in the Denver area on Jan. 21. On that day, Air Traffic Control issued a notice advising pilots of problems with GPS reception spanning about 8,000 square miles in the Denver area.

The advisory, posted at 10:33 p.m. Denver time, said GPS was unreliable within a 50-nautical-mile radius of the Denver International Airport. Interference was likely to be experienced by aircraft on the ground and as high as 40,000 feet above sea level.

The advisory also said the Wide Area Augmentation System (WAAS) and Ground-Based Augmentation System (GBAS), both designed to make navigation with GPS more precise, as well as the ADS-B collision avoidance and traffic management system, would be unreliable.

Pilots reported other systems affected such as transponders that help radar controllers keep track of aircraft, traffic alert and collision avoidance (TCAS) equipment, autopilots, electronic flight bags and terrain warning systems.

Pilots trying to land at Denver International and the much small Centennial Airport 20 miles to the south reported a variety of problems.

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