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<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.
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