NOAA/GSD Ground Based GPS-IPW SOPAC supports a NOAA/GSD Ground-Based GPS Integrated Precipitable Water Vapor Demonstration Network (GPS-IPW) site at the Scripps Institution of Oceanography (sio3) GPS station. The site is located near the Birch Aquarium at Scripps, and data are accessed from the site at 5-minute intervals. This link describes the NOAA/GSD project.