Position, Navigation and Timing: the technology the modern world runs on

Every time you tap your phone to pay, follow a route across an unfamiliar city, or send a message, you're relying on a technology most people never think about. The same technology helps a pilot find a target, keeps the trains running to time, and makes sure the cash machine pays out. It's called Position, Navigation and Timing (PNT) and modern life would grind to a halt without it.