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Question #655 posted on 10/04/2003 2:17 a.m.

Dear 100 Hour Board,

I don't know what allows a GPS unit to work in certain areas and not in others, but I'm quite sure that the original (and -- I think -- only) GPS satellite constellation is owned by the U.S. Government and virtually covers the whole surface of the earth. It's primary intent, after all, is to aid the U.S. military. We wouldn't want our tanks to get lost when they invade Beijing.

- D.