163. Alternative LINK: Sat Nav ~ Reliable?

SAT NAV: To infinity and beyond…or just another fad?

The 3.4bn-euro (£2.3bn; $4bn) project will give civilian users a satellite navigation and positioning service that is ten times more accurate than the alternatives available today.

While public signals from GPS are already widely used by the likes of sailors, mountaineers and motorists, the US military reserves the right to limit its use or switch it off for security reasons.

So, how reliable is it then?

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