This has to do with using satellite
tracking in getting the location of anything in the
world. The satellite can go round the earth twice
a day. It travels as fast as 12, 000miles. These satellites
weigh as much as 4000pounds and are located just above
the earth. The tracking is done through the orbiting
of the satellite around the earth. GPS actually means
Global Positioning System.
Most people are used to GPS
tracking for cars, but it is possible to use it
to track anything that actually has the right device
that can send a signal. Only four of these satellites
can be seen. When the GPS is initiated, it sends a
signal to one of these four satellites, and the satellite
sends the information back.