Without such a measurement, a GPS receiver must use a generic model or receive ionospheric corrections from another source (such as a Satellite Based Augmentation System).

A network of ground stations known as the WAAS (Wide Area Augmentation System) monitors and corrects errors caused by atmospheric changes and other factors.

Pitch drop-back may be controlled using a Stability Augmentation System or Stability Control and Augmentation System.

Through the use of these Augmentation Systems an individual GPS receiver is able to correct its own position, offering a much greater accuracy.

DGPS can refer to any type of Ground Based Augmentation System (GBAS).

It is called the Ground Based Augmentation System.

One of the largest users of the new signals will be airlines, employing the Federal Aviation Administration's new Wide Area Augmentation System.

Experience with Ground Based Augmentation System (GBAS) also showed differences.

Flight controls are servo-assisted, with a Stability Augmentation System fitted.

Local Area Augmentation System.