This section of the website provides access to the information needed to develop and build equipment to use the civilian services of GPS and its augmentations.
It is the official policy of the U.S. government to provide open, free access to such information.
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Interface Control Documents & SpecificationsInformation on the civil GPS signals and codes broadcast at the L1, L2, and L5 frequencies
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Performance Standards & SpecificationsTechnical performance levels that users can expect from GPS and related systems
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Federal Radionavigation Plan (FRP)Official source of radionavigation policy and planning for the federal government, including GPS and other space and terrestrial systems
Hosted by the Coast Guard Navigation Center
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Pseudorandom Noise (PRN) Code AssignmentsPRN code assignments for each GPS satellite and other transmitters of GPS codes at the L1, L2, and L5 frequencies
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Satellite Antenna Panel Patterns, Phase Center Offsets, & Group Delay and Inter-signal Correction ValuesTechnical data about the GPS Block IIR, GPS Block IIR-M, and GPS III satellites that can help improve the accuracy of GPS calculations
Hosted by the Coast Guard Navigation Center (USCG.gov)
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Codeless/Semi-Codeless GPS Access CommitmentsGovernment commitments to support codeless/semi-codeless civilian access to the current P(Y) signals during the transition to the modernized L2C and L5 signals
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Interface Control Working Group (ICWG)The Interface Control Working Group discusses and develops updates to the GPS technical documentation