Many UK emergency services are now using what3words to help find people faster. Every 3m x 3m location in the world can be found using just three words. Be prepared and download the free app.
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It's a privately owned, proprietary system. I'm not aware of any vehicles that have it on their built in sat nav systems as they would have to pay the patent owner for it on every unit, and rescue services have to pay for a licence for every employee who uses it. It's a mess.
To clarify; what3words does not charge emergency services to use the system. what3words is built into Mercedes-Benz, Tata & Triumph vehicles as well a number of navigation apps. You can see more here: https://what3words.com/products/
