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

I think they turned off the encryption of the low bits back in Clinton's 
timeframe, when other countries started threatening to launch their own 
satellites. I think civilian GPS is quite accurate now.

Especially if you're measuring something that isn't moving, and you can let 
the device sit for a day, you can get down in the milimeter range.

-- 
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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