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GPS (and its equivalents) is a system, not a product. It means Global Positioning System, and consists of a constellation of 20-odd satellites (plus a few spares) and some ground stations to control them. GPS is the US originated system (and the original), and there are several others from different nations. These systems are based upon the ability to find a location by comparing radio waves from several different sources, and of having an exact knowledge of where these sources are. Your hand (or car) device is a complex computer that listens for the signals of several of these satellites, and from this data computing your location. You need at least four good quality signals to compute a location. Forest cover, canyons (including city streets), and other variables will degrade the signal. But you will still be given a number which may thus have a degree of uncertainty associated with it, but seldom is this qualification offered. Higher quality outdoor devices will indicate whether the satellites are at suitable azimuths, and of course, those used by surveyors have quite superior properties.

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