How do sat navs work?
Sat Nav or GPS systems use the Global Positioning Satellite which orbits the earth. The GPS locks into the Sat Nav receiver in your unit and locates its position on the surface of the earth. Calculating longitude, latitude and altitude, the position is laid over a standard road map which accurately reveals the driver’s position to within ten metres. Built-in Sat Nav software can also work out the easiest route between any two points on the map and can combine average road speeds and other data, if necessary, to advise you on arrival times and road conditions on route.
