Welcome to the GPS Seamless Archive Center (GSAC) at the Scripps Orbit and Permanent Array Center (SOPAC), Scripps Institution of Oceanography (SIO). SOPAC participates in the GSAC at all levels, including Retailer and Wholesaler, and is involved in the development of the software that supports the GSAC. Learn more about SOPAC's participation in the GSAC [...] What is GSAC? The GPS Seamless Archive Center is a collection of GPS data archives and their operating agencies who agree to exchange information about their individual data holdings in order that users need not contact each archive separately to locate desired information. Additional information on GSAC can be found at UNAVCO, GSAC's current umbrella organization.