Global Navigation Satellite Systems (GNSS) provide accurate positioning, navigation and timing (PNT) information for industrial, consumer and military applications. Topics covered include the equipment required, sources of GNSS error and correction techniques, and threats to GNSS signals and mitigation solutions. The book also includes how GNSS is combined with other sensor technologies such as inertial navigation systems (INS), laser (LiDAR), sound (radar) and vision (cameras) to enhance navigation and situational awareness for autonomy. Written by GNSS experts at Hexagon's Autonomy and Positioning division, a global leader in assured autonomy and positioning, the third edition includes updates to the various GNSS constellations (GPS, GLONASS, BeiDou, Galileo and more), recent technology advancements to enhance PNT accuracy, and a new chapter on the growing field of automotive autonomy. Real-life applications across transportation, agriculture, mining, marine, unmanned vehicles, defence, survey and more demonstrate how GNSS and autonomy are enabling a sustainable future.