What Are the Functions of a GPS Unit?
GPS, or the Global Positioning System, is a network of 24 satellites surrounding the earth and five ground stations. An individual GPS unit uses the data from this network for a number of useful functions.
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Location
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A GPS unit gets information from several satellites to pinpoint your exact geographic coordinates. This is useful in situations when drivers or hikers become lost and need to be rescued.
Navigation
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When you need to get to another location, your GPS unit can provide directions. Enter your starting point and destination address to get turn-by-turn directions from your GPS unit.
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Tracking
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Commercial GPS units emit a signal to identify where shipments are, monitor mass transit vehicles and guide ambulances through the best route.
Mapping
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The locations of many typical traveler pit stops have been mapped and entered into GPS user networks. As you drive, your GPS unit can identify the closest gas stations, restaurants and hotels and tell you how to get to them.
Timing
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When you enter a destination into your GPS unit, it calculates the length of time it will take to get there. Throughout your trip the unit recalculates the data, updating your exact arrival time.
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References
- Photo Credit handheld gps image by Christopher Dodge from Fotolia.com
