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The hon. Lady will be aware that all our systems currently run under GPS—the global positioning system—and it is not necessary for us to operate under any other system. This is about resilience and whether we need an alternative system. What happens in our negotiations with Europe between now and the end of the year will obviously be a matter for the negotiators, but I am confident that we will continue to work alongside the United States on GPS or, indeed, that we will provide further details to the House on what we plan to increase resilience.