The International GNSS Service - in support of GNSS applications in the frame of GGOS

Global Navigation Satellite Systems (GNSS) underpin a wide range of scientific and societal applications across a broad spectrum of timescales and disciplines, such as positioning navigation and timing (PNT), surveying, environmental and climate research, geohazard risk reduction, or space weather monitoring. Most of these applications rely on accurate clock corrections and precise orbit models based on a stable global reference frame, along with well defined conventions for antenna calibrations and system biases.

Established over 30 years ago, the International GNSS Service (IGS) meets these critical needs by continuously delivering a suite of openly accessible high-quality data, products, standards, and services. All IGS products adhere to a core principle: solutions from multiple analysis centres are rigorously compared, combined, and provided at maximum accuracy over latencies ranging from real-time to final.

We present the full range of IGS data and products available to the user community, with particular emphasis on recent additions and expansions. We also outline the critical components of the IGS infrastructure that enable these products, and discuss upcoming developments designed to foster broader community participation and innovation. Finally, we position IGS activities within the wider geodetic landscape, highlighting its role as a core component of the global geodesy supply chain.