CGSIC Bulletin: New GPS Interface Specifications (IS) and Interface Control Documents (ICD)

The U.S. Space Force Space and Missile Systems Center  (SMC) has issued official, signed Interface Specification (IS) and Interface Control Document (ICD) revisions:

IS-GPS-200M Navstar GPS Space Segment/Navigation User Interfaces

IS-GPS-800H Navstar GPS Space Segment/User Segment L1C Interface

IS-GPS-705H Navstar GPS Space Segment/User Segment L5 Interface

ICD-GPS-240D Navstar GPS Control Segment to User Support Community Interface

These documents can be found at  GPS Technical References (  and at 

Past versions of these documents are archived at  GPS Technical References (  and at  where changes (Interface Revision Notices  (IRN)) incorporated into the new documents also can be found.

The Space Force is soliciting public comments on the following Proposed Change Notices (PCNs).

RFC-00467: 2021 Proposed Changes to the Public Documents

While these PCNs use the August 2020 versions of the ICDs as baseline documents, any approved changes will be incorporated by the next document revisions. Comments are due August 24, 2021

SMC has also announced the date of the next Public Interface Control Working Group meeting.  Full details will be provided in an upcoming Federal Register Notice but advance notice can be found at