Currently, Google Maps navigation system can display the speed at which the car is moving. However, many people wonder why the speed shown on the map differs from the speed displayed on the car's ...

"But wherever your car comes from, the speedometer still needs to be reasonably accurate, although it's unlikely to be as precise as your phone's GPS, which uses satellites to pin-point its position.

"But wherever your car comes from, the speedometer still needs to be reasonably accurate, although it's unlikely to be as precise as your phone's GPS, which uses satellites to pin-point its position. ...