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US changes to GNSS

It is understood from Inside GNSS that the GPS Directorate is requesting public comment on proposed changes to several interface specification (IS) and Interface Control documents (ICDs) for GPS signals in space.

Developments have prompted the changes, including work on the Next-Generation Operational Control Segment (OCX), design of the GPS Block III satellites, and a new memorandum of agreement among several federal agencies that would introduce new satellite outage file (SOF) to Notice Advisory to Navstar Users (NANU) messages.