Orchid XP v8 wrote:
>>> 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.

Sometimes, for a few minutes, a GPS receiver will be wrong, I've noticed. 
I'm assuming it happens when it picks up on a satellite for which it doesn't 
have ephemeris or something.  It usually corrects itself after a minute or less.

Of course, a GPS built into a car is going to assume the car is on one of 
the roads on the map, which can also throw things off.

-- 
Darren New, San Diego CA, USA (PST)
  "How did he die?"   "He got shot in the hand."
     "That was fatal?"
          "He was holding a live grenade at the time."

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