Excerpt: NGS computes improvements to the Global Positioning System (GPS) orbits in order to achieve an accuracy of 7 cm, Root Mean Square (RMS), and is working to attain an accuracy of 5 cm RMS. NGS distributes orbit data in a time frame to meet users? requirements, including a rapid product (8-14 cm accuracy) available within 16 hours after data collection, and a more accurate product available within 7 to 10 days of data collection. Other orbit products include improv...