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News & Press: Other Items of Note

Next GPS Satellite Launch

Wednesday, January 27, 2016   (0 Comments)
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(Forwarded by Prof. Gary Jeffress, Ph.D., RPLS)

All CGSIC (Civil GPS Service Interface Committee):

In February, the Air Force plans to launch the twelfth, and last, satellite in the Block IIF series of modernized GPS spacecraft. The Air Force has produced 12 IIF satellites, featuring new clocks, new civil and military signals, and other upgrades for enhanced accuracy and robustness. Currently, there are 31 GPS satellites in operational service, including 11 Block IIF satellites and 20 spacecraft from previous generations. To learn more about the GPS constellation, go to

Date/Site/Launch Time: No earlier than Thursday, Feb. 4, 2016, from Space Launch Complex-41 at Cape Canaveral Air Force Station, Florida. 18 minute launch window opens at 1347Z, 0847 EST.

Rocket/Payload: A United Launch Alliance Atlas V 401 will launch the GPS IIF-12 mission for the U.S. Air Force.

Launch Updates: To keep up to speed with updates to the launch countdown, dial the ULA launch hotline at 1-877-852-4321 or join the conversation at, and; hashtags #GPSIIF12 and #AtlasV.

Constellation Changes: The Air Force Second Space Operations Squadron (2SOPS) indicates that IIF-12, SVN-70/PRN-32, will replace SVN-41/PRN-14 in the F plane slot F1. SVN-23/PRN-32 (IIA-10) will be taken out of the operational constellation prior to SVN-70 launch and sent to Launch, Anomaly, Resolution, and Disposal Operations (LADO). PRN-04 is tentatively scheduled for assignment to the first of the new generation of GPS-III satellites, available for launch sometime in 2017. SVN-23, launched on 26 November 1990, has been an "Iron Bird" workhorse in the E-plane and has successfully served the world's GPS users for over 25 years. This is over 18 years past its designed service life, having operationally outlasted (and in many cases, outperformed) its peers on-orbit due to the diligent efforts of the men and women of the U.S. Air Force. SVN-41 will be re-phased from the F1 location to a newly defined F7 node (GLAN = 45°) once SVN-70 is set healthy.


Rick Hamilton
CGSIC Executive Secretariat
GPS Information Analysis Team Lead
U.S. Coast Guard Navigation Center

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