GPS is a system made up of three parts (satellites, ground
stations, and receivers) that help in determining ground location with
incredible precision. The satellites continuously transmit a signal and its
receiver calculates its distance from the satellite. The positions of the
satellites are used by the receivers as reference points to determine the
location of the GPA receiver.
For instance, when a hiker gets lost in the woods and has
access to a GPS receiver, he will easily be able to determine his current
location. Marking his starting location on a GPS receiver will also assist him
into finding his way back.
