[Tagging] Comments wanted: Placement

[John F. Eldredge]

Martin Koppenhoefer <dieterdreist at gmail.com> wrote:

> 2012/12/20 Pieren <pieren3 at gmail.com>:
> > The point about car navigation systems is
> > incorrect. It does not care about the highway way position (and no
> GPS
> > device is accurate enough to determine on which lane you are).
> 
> 
> I wouldn't be so sure about that, professional GPS devices are that
> precise, and by combining several signals also consumer grade devices
> might be able to get to this precision (i.e. combining glonass, gps,
> galileo).
> 
> cheers,
> Martin
> 
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The accuracy of the consumer machines varies greatly by circumstances.  I have had times it was accurate to within a meter or so, and I once had a reading that was off by about 20 kilometers (admittedly, the latter was during a solar flare).
-- 
John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria