Iridium Satellite Time & Location

Following its acquisition of Satelles, Iridium® now offers Satellite Time and Location (STL)—a Positioning, Navigation, and Timing (PNT) service that improves the resiliency and survivability of critical infrastructure when Global Positioning System (GPS) or Global Navigation Satellite System (GNSS) signals are absent or disrupted.

Iridium STL was built to address vulnerabilities and limitations faced by GPS and GNSS—with a time and location capability that secures PNT-dependent applications against disruption and manipulation.

Transmitted from Iridium’s Low-Earth Orbit (LEO) network, the Iridium STL signal is about 1,000 times stronger than GPS or GNSS, allowing it to penetrate buildings and other hard-to-reach areas with only a receiver and small antenna.

Today, Iridium STL is the only LEO-based PNT solution commercially available worldwide.

Key Markets

Used as a primary source or an essential backup for dependable time and location information, Iridium STL is trusted for PNT-dependent applications by numerous enterprises, including:

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More Info


  • Brochures

  • Videos

  • Datasheets & Research

  • Iridium STL Support Materials

Expert Findings

  • NIST

  • U.S. DHS

  • U.S. DOT

  • European Commission


  • 5G Timing Synchronization


  • Alternatives to GPS

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