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GPS satellite SVN-47 decommissioned, SVN-41 returns to broadcast almanac

January 24, 2022  - By
Artist's rendition of a GPS-IIR satellite in orbit. (Image:

Artist’s rendition of a GPS-IIR satellite in orbit. (Image:

The U.S. Space Force has announced the decommissioning of GPS satellite SVN-47 (PRN-22), which officially took place Jan. 18.  The satellite has been unusable since Dec. 2.

SVN-47 was a replacement satellite in the second generation of GPS satellites (GPS-IIR), launched Dec. 21, 2003.

The announcement was made in a Notice Advisory to NavStar Users (NANU 2022001) issued by NAVCEN, U.S. Coast Guard.

The designation PRN-22 will be used to bring SVN-41 back in to the active constellation. After 2200 Zulu on Jan. 2o, GPS will transition SVN-41 (PRN-22) into the broadcast almanac for all satellites, and SVN-41 will resume transmitting L-band signals. The almanac transition, accomplished one satellite at a time, will require approximately 24 hours to complete.

A second NANU emphasized that “Before, during, and after transition SVN-41 (PRN22) will remain unusable until further notice.”

SVN-41, the sixth of the GPS-IIR satellites, was launched on Nov. 10, 2000, and set to active service a month later on Dec. 10. It was decommissioned in July 2021.

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About the Author: Tracy Cozzens

Senior Editor Tracy Cozzens joined GPS World magazine in 2006. She also is editor of GPS World’s newsletters and the sister website Geospatial Solutions. She has worked in government, for non-profits, and in corporate communications, editing a variety of publications for audiences ranging from federal government contractors to teachers.