Satellite-Based Augmentation System (SBAS)

The Satellite-Based Augmentation System (SBAS) is based on GNSS measurements from accurately-located reference stations deployed across an entire continent. The differential corrections and integrity messages are broadcast over a continent using geostationary satellites as an augmentation or overlay of the original GNSS message. Systems in place are WAAS (USA), EGNOS (Europe), GAGAN (India) and MSAS (Japan) which deliver corrections at no cost for sub-meter positioning.