>> My satnav device cannot accurately determine which motorway I'm on.
>
> Yeah, and your calculator can't run DOOM. We already know you make bad
> technology purchase choices. ;-)

Last time I checked, TomTom is the leading brand.

>> Given that a six-lane motorway isn't exactly small, this implies a
>> very large inaccuracy in the GPS location.
>
> No, it implies a crappy GPS receiver.

My dad has a crappy GPS receiver. It takes approximately 30 minutes to 
locate a GPS satelite. Mine, on the other hand, requires nearer to 30 
seconds...

> Plus, GPS while you're moving is somewhat harder to get accurate than
> GPS while you're stationary. The way you get millimeter precision even
> when the encryption is turned on is to leave the receiver in the same
> place for a couple of days, integrating the position samples.

Just because I'm on a motorway doesn't mean I'm *moving*! :-P

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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