> GPS computation is accurate, with military access, to less than a yard.

So I've heard. This is only useful if you're in the military. ;-)

> Civil usage of GPS is accurate to 30 yards/meters.

That sounds more like it.

> Remember that GPS is operated by the army of the USA (or whatever you
> name it), and they can switch it down whenever they want. (or rather,
> keeping it on only for the happy fews with the unscrambling devices...)

*Other global positioning systems are available. ;-)

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