Official U.S. government information about the
Global Positioning System (GPS) and related topics
Resilience Through Responsible Use of PNT
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This page provides information and resources for improving positioning, navigation, and timing (PNT) resilience, especially in critical infrastructure.
As stated in the U.S. Space-Based PNT Policy: "The widespread and growing dependence on GPS by military, civil, and commercial applications, systems, and infrastructure make the performance of many of these systems inherently vulnerable if disruption or manipulation of GPS signals were to occur. GPS users must plan for potential signal loss and take reasonable steps to verify or authenticate the integrity of the received GPS data and ranging signal, especially in applications where even small degradations can result in loss of life."
Guidance for Critical Infrastructure Owners & Operators
Presentations & Information Sheets
- Jun 2021: Understanding vulnerabilities of positioning, navigation, and timing (PDF)
- May 2021: NIST-DHS presentation at RSA Conference 2021 USA
- Jan 2020: Responsible use of PNT in the financial services sector
- Mar 2019: Time — The Invisible Utility
- Dec 2017: Responsible use of GPS for critical infrastructure
Best Practices
- Jul 2020: Time guidance for network operators, CIOs, & CISOs (CISA.gov)
- Jan 2017: Improving the operation and development of GPS equipment used by critical infrastructure (PDF, us-cert.gov)
- Jan 2015: Best practices for improved robustness of time and frequency sources in fixed locations (PDF, CISA.gov)
Implementation Frameworks
- Feb 2021: Free resources to protect critical infrastructure from GPS spoofing (DHS.gov)
- Feb 2021: Foundational PNT profile: Applying the cybersecurity framework for the responsible use of PNT services (NIST.gov)
- Dec 2020: Resilient PNT conformance framework (DHS.gov)
GPS Week Number Rollover
Federal Activities
Demonstration & Testing
- Mar 2020: GPS backup/complementary PNT demonstration (transportation.gov)
- Apr 2020: GPS spoofing test event (DHS.gov)
Planning
- Aug 2021: National R&D Plan for PNT Resilience (700 KB PDF)
- Jan 2021: DOT report to Congress on NTRSA (transportation.gov)
Outreach
National Policy
- Jan 2021: U.S. Space-Based PNT Policy (archives.gov)
- Dec 2020: National Space Policy
- Feb 2020: Executive Order on Strengthening National Resilience Through Responsible Use of PNT Services (federalregister.gov)
- Dec 2018: National Timing Resilience and Security Act (NTRSA)
- Additional legislation on backup and complementary PNT
