London-based Inmarsat tests an overlay system to enhance the GPS signals received in the UK.
Inmarsat's system is in a trial phase at the moment. It's using an ageing satellite positioned out over the Atlantic to transmit the assurance data.
If Galileo goes down, the EU's Egnos system goes down. If GPS were to go down, the UKSBAS - the UK Space-Based Augmentation System - would also be unavailable.America, China, Russia, Japan and India all run augmentation systems. And Inmarsat has recently become involved in a project to develop one for Australia and New Zealand.
Since leaving the 27-member state European Union, the UK has been looking for possible alternatives to Galileo through its Space-Based Positioning Navigation and Timing Programme.
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