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The satellite-free alternative to GPS
Nature Podcast
The Problem With Speed of Light Radio Signals
Scientists have been working on a system that doesn't need satellites at all. It uses existing fibre-optic networks to transmit radio signals, which are picked up by the receiver that figures out the position. The team were able to use higher bandwidth signals compared to conventional satellite systems and less affected by things like buildings being in the way. As you're able to send more information can still help you find your location even when the signal hits objects.
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