Originally Posted by
GommeInc
Sat navs are updated often, warn users of accidents*, come with the function that can direct you around a road block, warn you of speed and traffic cameras*, give the best choice of route, are safer, show a closer to street view than a birds eye view of a location, constantly updates you of your location in correlation of time travelled and miles left, and use less petrol (stopping and starting, just to read a map wastes more petrol than just continuosly going).
£150 over some thing that costs about £7.99 and will last long and isn't out of date the moment you get it is better value really :P