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Although GPS was designed for military use, many
thousands of civi lians make use of it. The satellites actually
broadcast two signals, one is only formilitary use, and the
ther can be used by both military and civilians. Since GPS is
passive (you only need to receive the signal), there are no
restrictions on who can use the signal available to civilians.
GPS technology can be used in a variety of fields besides
providing navigation for vehicles on the sea, in the air and
on the ground. GPS applications also include keeping track
of where a fleet of trucks, trains, ships or planes are and
how fast they are moving; directin gemergency vehicles to
the scene of an accident; mapping where a city's assets are
located ; and providing precise timing for endeavors that
require large-scale coordination.