SA>Global Positioning System (GPS)-equipped mobile phones and other
  >devices are rapidly emerging as tools allowing people to track the
  >whereabouts of truant children, spouses, workers, pets, and others,

  One of the amateur radio digital modes is a deal developed by Bob
Bruninga, WB4APR...called the Automatic Position Reporting System, or APRS
for short. Programs for DOS, Windows, and I think even Macintosh
systems...are used by ham radio operators in a wide range of
situations...from tracking severe weather...to tracking participants in a
race...among other things. Depending on their computer and rig setups, hams
can manually update their position, or link with an attached GPS to input
that data for them.

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