GPS devices - never be lost again By David C Skul GPS devices (GPS comes from Global Positioning System) are devices that can determine your location anywhere on the planet. They do this by calculating the distance from where the GPS device is to satellites orbiting earth. The device must achieve signals from at least three satellites for returning a two-dimensional position. If it finds more than four, the GPS device can return a three-dimensional position, also measuring the height. The location that the GPS device returns is quite accurate, the normal GPS devices can determine your position within a range of ten meters, but professional ones have mechanisms that mostly remove all the errors. A thing that must be known is that GPS devices cant work too good in cities with tall buildings because they obstruct the sky and the GPS devices connection with the satellite, but in an area where most of the sky is visible the work perfectly. There are a lot of GPS devices on the market nowa
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