Missions. The TRIAD 1 satellite was a later, more advanced navigationsatellite that was part of the U.S. Navy’s Transit, or NAVSAT system. Gundlach, J. H;
American Practical Navigator – Chapter 11 SatelliteNavigation. United States government. 2002. Global Positioning System(页面存档备份,存于互联网档案馆) Open Courseware from