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Navigation: Satellites

Asked by Ben Obese-JectyConservativeMinistry of DefenceTabled Answered 16 September 2025UIN 76403

The question

To ask the Secretary of State for Defence, pursuant to the Answer of 8 September to Question 72215 on Navigation: Satellites, what Alternative Position, Navigation and Timing technologies are being further investigated by the DE&S Space Delivery Team.

Answered by Luke Pollard

To ensure that Position, Navigation and Timing (PNT) capabilities are resilient when satellite systems are unavailable or have been compromised, the Ministry of Defence’s (MOD) DE&S Space Delivery Team is focused on developing four initial key technology innovations, these include: developing Enhanced Long-Range Navigation (eLoran) capabilities, exploring and utilising Satellite Signals of Opportunity (SATSOO), investigating Chip Scale Atomic Clocks (CSAC) and exploring the applications of Data Fusion. Additional specific technologies will also be identified for investment at a later point in the programme but options for these remain unscoped at this time.

Due to the risk of compromising operational security, it would be inappropriate for us to provide any further details on the specific investigations that the Department is undertaking.

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