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The various GPS systems in several countries employ satellites that do not use RADAR. The reason is that it's your GPS receiver that determines where you are on earth based on -Radio- signals sent from each visible GPS satellite.
How it works is this . . . the satellites transmit radio signals to earth. Your GPS receiver detects and 'reads' these radio signals. The radio signals send a lot of information, but the most important is the precise time, based on an internal atomic clock in all 32 satellites (24 of which are 'on' at any given moment) (All adjustable from one of several ground stations).
Your GPS receiver, using its own precise time clock (frequently set to match the satellite's time) uses the length of time that the radio signal takes to make it from the satellite(s) to your location. Since the speed of radio waves is precisely known, the GPS receiver uses a very simple formula to calculate the distances from all the satellites that it has 'locked into'.
The GPS receiver picks the 3 best signals to obtain distances from, and comes up with a good location of the receiver. The receiver can show this information on a map, either handheld or in your car, or present you with map coordinates in the form of latitude and longitude - these being useful to surveyors and others. For various technical reasons, readings from a 4th satellite are required, but 5 'locked in' satellites are often the fewest that it is practical to use.
The best GPS receiver setups can determine the accurate location of the receiver (therefore, your position, also) as close as 1 centimeter (length of a sugar cube), up to within several yards. This accuracy largely depends on how many satellites are 'locked in', and how expensive the receiver is. (How many 'extras' it contains to improve accuracy.
Example - I use a GPS receiver with several extras in it, and can get an earth location within 4 inches of the actual location. The cost was about $6,000 for the receiver itself.
A car-mounted Tom-Tom type receiver, on the other hand, only needs to know where you are within several yards, has fewer 'extras' and costs somewhere around $200.
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