CGSIC: GPS Continues Modifications

Schriever Air Force Base – 27 February 2019 – The 2nd Space Operations Squadron will implement the GPS Issue of Data, Clock software modification sometime in the summer of 2019 in accordance with established guidance. This modification is in compliance with GPS Interface Specifications IS-GPS-200, which is published for manufacturers to ensure continued device compatibility.

As the largest Department of Defense spacecraft constellation, operators must modify processes, software, and operations in order to meet the ever-growing demand for GPS signals. The squadron conducts software modifications regularly to support the constellation.

These modifications are primarily transparent to users, specifically those with IS-GPS-200 compliant devices. Users who experience issues with their devices or receivers should contact the manufacturer to troubleshoot the problem.

Additionally, the U.S. Coast Guard Navigation Center provides information and services to civil GPS users. They can be contacted at 703-313-5900 or online at