Jim Henderson wrote:
> What does surprise me is that in a moving aircraft, the GPS receiver in 
> my phone is useless.

Not all of them are. My brother has a trace from his exercize watch that 
shows him flying across country.

> I could as well, but then again, there are lots of wireless signals 
> flying around in open space, but I would expect something that's designed 
> to fly through the air to have some shielding against it.

Especially that in which the general public will be flying. I'm not 
surprised there are industrial settings where following the rules is more 
important than in an airplane passenger compartment.

-- 
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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