卫星指路

There is no area of commerce, industry, agriculture, transportation in Britain that is not now dependent upon GPS and if we lose GPS, we lose critical services in all of those areas.

Please continue on this route for the next 27 minutes.

In cars, in ships, in planes, in our phones, we'll be lost without sat nav. It's amazing - some might say alarming - just how rapidly it sent us off in a new direction, away from self-reliance towards technological dependence, which would be fine if GPS and its sister systems were all utterly dependable. But they're not, and that could have dangerous, potentially disastrous consequences. We'll get onto what those are in due course. But before we set off, it might help to get our bearings.

Professor David Last is a former president of the Royal Institute of Navigation.

Well, GPS is the global positioning system. It's a satellite system whose job is to let us measure where we are anywhere on earth. Set up by the US military, and now of course it's used by civilians. It's what drives our car navigators, our sat navs. GPS is American. In Europe we have a system called Galileo, which is being created at the moment. The very first satellites are up and it's just beginning to work. The Chinese have their own system, or Compass Beidou. The Russians have their system and the Japanese are developing a system.

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