 RE : Are satellite navigation systems reliable?
Satellite navigation systems have become extremely popular over the past couple of years. They used to be things which only few could afford but these days it seems that most people have one fitted into their cars.
Generally the satellite navigation system receives a signal and it shows you exactly where you are. You need to tell it where you want to go and it will work out the quickest route and tell you exactly where to turn etc through voice software. | 
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