Editing Wide Area Augmentation System (section)

===User segment===
The user segment is the GPS and WAAS receiver, which uses the information broadcast from each GPS satellite to determine its location and the current time, and receives the WAAS corrections from the Space segment. The two types of correction messages received (fast and slow) are used in different ways.

The GPS receiver can immediately apply the fast type of correction data, which includes the corrected satellite position and clock data, and determines its current location using normal GPS calculations. Once an approximate position fix is obtained the receiver begins to use the slow corrections to improve its accuracy. Among the slow correction data is the ionospheric delay. As the GPS signal travels from the satellite to the receiver, it passes through the ionosphere. The receiver calculates the location where the signal pierced the ionosphere and, if it has received an ionospheric delay value for that location, corrects for the error the ionosphere created.

While the slow data can be updated every minute if necessary, [[ephemeris]] errors and ionosphere errors do not change this frequently, so they are only updated every two minutes and are considered valid for up to six minutes.<ref>{{cite web |title=DGPS on Garmin Receivers |url=http://www.gpsinformation.org/dale/dgps.htm#waas |access-date=2007-04-13 }}</ref>