As technological advances make GPS/GNSS devices more affordable, our lives are becoming increasingly dependent on precise positioning and timing. The aviation sector has been using precise positioning GNSS for decades to help guide airplanes in landing approaches especially during difficult weather conditions.
GNSS refers to constellations of satellites broadcasting signals from space that transmit positioning and timing information to GNSS receivers on Earth. The receivers then use this information to determine their location. These systems include the American GPS, European Galileo, Russian GLONASS, Chinese BeiDou, Japanese QZSS (Michibiki) and the Indian NAVIC system.
Source: Aerospace Testing International