GPS Systems 
GPS, or Global Positioning System, is a satellite-based navigation system developed by the U.S. Department of Defense to provide a consistent, accurate method of simplifying navigation.
It was originally designed for the military, however, it provides both commercial and recreational users 24 hour, worldwide navigation coverage with a possible accuracy to 15 meters (49 feet). Like any other method of navigation, you should not rely solely on your GPS.
You should use every method of navigation available and compare the results to make sure that you are where you think you are.
How Does GPS Work?
GPS Navigation uses orbiting satellite signals to determine your position. These satellites continually send out radio signals containing precise position and time information back to earth. By knowing the position of 3, 4 or more of these satellites and calculating various time differences between the transmitted signals, your GPS receiver can determine its present position anywhere on earth. Once underway, your GPS continually updates your position and provides speed and track information.
What information do I get from a GPS?
Various manufacturers make GPS's and some have more features than others but all give basically the same information. Almost all of them have graphic displays and some even have a cartographic feature which allows you to see your location on an electronic chart. If you are going for a fixed mounted GPS rather than a handheld portable, I would vote for a model that does support electronic charts. This provides yet another way of checking your position, especially if you are in site of land or an object on the chart.
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