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Maintain the International Celestial Reference System and Frame and the International Terrestrial Reference System and Frame. Provide timely and accurate data on the Earth's orientation for current use and long-term studies.

International Celestial Reference Frame, ICRF (coordinates of extragalactic objects)

International Terrestrial Reference Frame, ITRF94 (station coordinates & velocities)

Earth orientation Parameters, EOP (pole coordinates, UT1, LOD)

IERS Conventions

Atmospheric data (AAM, wind, pressure)

Directing Board. Central Bureau(monthly bulletins). Bureaus, responsible for deriving and distributing IERS products. Coordinating centres for VLBI, LLR, GPS, SLR, DORIS, and for Monitoring the Global Geophysical Fluids (MGGF). Analysis Centres produce global solutions (station positions and velocities).