As the Global Positioning System (GPS) satellite array nears complete configuration, the versatility of the system is becoming apparent. Using GPS in combination with other techniques, such as PRARE, DORIS, SLR, and VLBI allows for quick and highly accurate determinations of orbits, earth rotation, and crustal deformation. The papers in this volume examine the virtues of permanent satellite tracking networks and review the standards of GPS observation and analysis in geodesy and geodynamics.

This volume is the result of an IAG symposium held during the XX General Assembly of the International Union of Geodesy and Geophysics in Vienna, Austria, August 11-24, 1991.