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GPS
The Global Positioning System, or GPS, can show you your exact position on Earth any time, anywhere, in any weather. The system consists of a constellation of 24 satellites (with about 6 "spares") that orbit 11,000 nautical miles above the Earth’s surface and continuously send signals to ground stations that monitor and control GPS operations.
GPS satellite signals can also be detected by GPS receivers, which calculate their locations anywhere on Earth within less than a meter by determining distances from at least three GPS satellites simultaneously and determining their position using the timing of these signals. No other navigation system has ever been so global or so accurate. However, there is NO GPS which can be trusted to perform at all times in heavy tree cover or in steep and narrow valleys where GPS satellite signal masking can be present.
Probably the two most popular and leading models of handheld GPS receivers suitable for hiking, GPS treasure hunts and geocaching are the Garmin etrex and Magellan eXplorist ranges.
More about GPS
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