ANSWERS: 1
  • <h4 class="dechead">On One Hand: Makes Navigation Easy

    Global Positioning System (GPS) units, usually purchased for navigating in a car, can be tracked by a network of satellites from space using radio signals. This makes losing your position on the earth's surface quite difficult, as long as you have a functioning GPS unit.

    On the Other: Interference and Signal Problems

    The radio signals from the satellites may have trouble reaching the GPS unit under certain circumstances. If it's underground, in a city surrounded by concrete, or if there is atmospheric interference, a GPS unit may not function at all.

    Bottom Line

    GPS units do work, but planning for their limitations is the key to discerning how useful they'll be for individual users.

    Source:

    Scign.jpl.nasa.gov: How Does It Work?

    Mobile.plentystore.com: How Does GPS Work?

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