The Wide Area Augmentation System uses a system of ground
stations to provide necessary augmentations to the GPS (Global
Positioning System) SPS (Standard Positioning Service) navigation
signal.
"We call the tower the 'lockdown cafe'. We're under
house arrest for eight hours."
Source: Michael Coulter, president of the
Denver unit of the National Air Traffic Controllers Association, on
stricter guidelines for air traffic controllers at Denver
International Airport.
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